Chapter 3

If Willy were to get over the hedge with his net and dip it amongst the weeds of the pool, I dare say he will succeed in catching a few water-insects, which he can put in his bottle and bring to me. Of course the boy was delighted at the idea of dabbling with his net in the water--boys generally get immense fun from such amusement, and their clothes frequently not a little dirt. A weedy pond is a grand place for naturalists, and various are the beautiful and strange forms of animal life which are found there. Dipping amongst the duckweed and water-crowfoot is always attended with numerous captures, and Willy's bottle was soon full of active little creatures. Let us see what it contains. A large beetle is very conspicuous amongst the contents, now rushing to the top of the water, now sinking to the bottom, scattering far and wide the tiny water-fleas, and other little creatures by the strong and rapid movements of his swimming legs. This is the great water beetle; we will sit down on this clump of poplar tree by the side of the road, and take the beetle out and examine him; we must take care he does not bite our fingers as we hold him, for his jaws are powerful and sharp. Mr. _Dyticus_, for that is his learned name--from a Greek word which means "fond of diving"--is one of the most voracious of water-insects, but let us first examine his form. You see it is well adapted for the kind of life the beetle leads; look at that long oar-shaped pair of feet, what a broad fringe of hairs besets them, how admirably fitted they are for swimming; the wing-covers are smooth and glossy, without any furrows; by this I know the specimen to be a male, for the wing-covers of the female are furrowed. The structure of the forefeet is very curious; you observe its under portion forms a broad circular shield, covered with a number of sucking-cups, two or three being much larger than the rest; by means of these sucking-cups the beetle can attach itself securely to any object it wishes. The wings are large and strong, and situated, as in all the beetle tribe, under the horny wing-covers. I will put this bit of stick near his mouth; there, Jack, you see his strong jaws, and great use he can make of them I can tell you. If Willy were to put one of these beetles into his aquarium with his favourite sticklebacks, he would soon have cause to lament the untimely loss of some of them; woe betide the unfortunate fish or newt that is once caught by the strong jaws of this fresh-water tyrant! I have seen Mr. Dyticus rush upon a full-grown newt, and no twistings and writhings could free the victim from the fatal embrace. They will attack young gold and silver fish, and Mr. Frank Buckland has told us of the sad havoc these water-beetles do to young salmon, as witnessed by himself in a pond in Ireland. The forefeet you see are strong but small; the beetle uses them as claws in seizing its prey and conveying it to the mouth. A young and tender fish, you can easily imagine, Mr. Dyticus would very readily devour, but he will attack beetles as large and even larger than himself, seizing them on the under side where the head joins the body, the only soft place in a beetle. Dr. Burmeister, a naturalist who paid great attention to insects, tells us that he once kept a beetle related to the great water-beetle, and saw it devour two frogs in the space of forty hours. After the eggs are laid, which always takes place in the water, the larvæ are hatched in about a fortnight. In time--I do not know how long--these larvæ grow to the size of about two inches in length, and queer fellows they are, and very voracious and formidable-looking. Now, Willy, lend me your net, and I dare say we shall soon secure a specimen. What have we here? how the pond swarms with water-fleas! Oh! here is a treasure! What can it be? a long animated thread of glass--we will put it into a bottle by itself and I will tell you about it afterwards. Splash goes the net again, but no water-beetle larvæ. Never mind; what does the child's songbook say--

"If at once you don't succeed, Try, try, try again."

A capital little verse to remember, so we will try again; and there now we are rewarded by the capture of a dyticus larva--a creature with a long body--in some respects reminding one of a shrimp. Oh! look at his jaws, how wide he opens them! You see that the last segment of the body is provided with a long pair of bristly tails, by means of which the creature can suspend itself at the top of the water. I have often kept specimens of these larvæ in vessels of water and noticed their predaceous habits; they feed on the larvæ of other water insects, but are not able to destroy fish, not being furnished with jaws or bodies nearly so strong as the perfect insect itself possesses. When the larva wishes to turn into its pupa state, it makes a round hole in the bank of the pond it inhabits, and there undergoes its change, turning into a full-grown beetle in about three weeks' time. "Papa," said Willy, "I have often caught beetles that remind me of the great water-beetle, but they are not so large; what are they?" They belong to the same family as the great water-beetles, and are called _Colymbetes_, _Acilius_, _Cybister_; I do not know that they have any English names. Come, we have dabbled in this pond long enough for the present, let us proceed on our walk. "Well, but, papa," said May, "you have not told us what that long worm-like creature is in the separate bottle; do let us look at it again. Oh! really it is a curious creature, why it is as transparent as glass, now it jerks itself about, now it floats without motion in mid-water. What is it?" "I am inclined to think," said Willy, "judging from its wriggling, jerking motions that it must be the larva of some kind of gnat." Right again, my boy, it _is_ the larva of a gnat, and one known to naturalists by the name of _Corethra_; you see there are eleven divisions or segments in the body; the head is of strange form, and near the mouth are two hooked arms which spring from the middle of the forehead and bend down in front of the mouth; with these weapons the _Corethra_ larva seizes its prey and crushes it between two rows of sharp spikes placed under the mouth; after being bruised and mangled by this apparatus the prey is ready to be swallowed.

"But what," asked Jack, "are those four curious black bodies; one pair near the head, the other pair near the tail of the animal?" They are air-sacs, and are connected with the breathing or respiration of the larvæ. Some have supposed that they serve the same office as the swimming bladder of certain fish, which being compressed or dilated at will enables the creature to remain still in mid-water or to rise or sink in it. After a time the larva changes to a pupa, in which state it lives without eating for a few days, and then turns into a gnat. We now proceed on our walk and come to a part of the road which has a plantation on either side; we see a little active creature crossing the road and at once recognise a weasel. Let us keep quite still and silent, and we shall, I dare say, have an opportunity of watching it for a short time. Just look at him! how nimbly the little creature runs along; now he stops and raises his head as if listening for something, now off he starts again; he is evidently hunting, and probably is on the scent of a young rabbit, rat, or field-mouse. Ah! see he has caught something on the grass near the hedge; what has he got in his mouth? it is a small rat, I think; now he throws his flexible body over it and gives it one or two bites. Now, Jack, run up and catch him. Ah! he is off like a shot; you must not think to "catch a weasel asleep." I often see these little animals in my rambles, and always stop to witness their extraordinary activity. Weasels will sometimes climb trees and surprise some unfortunate bird on her nest; they are fond of eggs, and a bird's young brood are very dainty morsels; they will also eat moles and are sometimes caught in mole-traps. An excellent observer mentions a case of a mole-trap having been found many years ago with two weasels in it; they had been hunting in the mole's runs, had come in opposite directions, and "by a curious coincidence, must have both sprung the trap at the same instant." Weasels are generally classed as vermin and killed on all possible occasions; I think it is often a mistake to destroy them; no doubt they will occasionally catch a young rabbit or a leveret or suck a few partridges' eggs, but the common food of the weasel consists of such small animals as mice, moles, rats, small birds. In wheat or other grain ricks, they ought to be encouraged, as they enter them for the sake of the rats and mice they find there. I have been told by a friend that in some parts of Wales the farmers look upon the weasel as a friend, in consideration of the destruction it causes to mice and rats. A gentleman living near Corwen killed a weasel, and expected to receive the thanks of the farmer on whose land it had been killed; he was surprised to find that the farmer was by no means grateful. In this respect I think the Welsh farmers are wiser than the English ones. Hawks sometimes prey upon weasels.

Mr. Bell tells a story of a gentleman who was riding over his grounds, once having seen a kite pounce upon some object on the ground and rise with it in his talons. "In a few moments the kite began to show signs of great uneasiness, rising rapidly in the air, or as quickly falling, and wheeling irregularly round, whilst it was evidently trying to force some hurtful thing from it with its feet." After a short but sharp contest the kite fell suddenly to the ground, not far from where the gentleman was watching the proceeding. On riding up to the spot "pop goes the weasel," none the worse for his aërial journey, but the kite was dead, for the weasel had eaten a hole under the wing. The weasel makes its nest in a bank or in loosely-constructed stone walls; three or four young ones are generally produced. Some years ago I remember seeing a mother-weasel and three young playing about on a bank. It was a most interesting sight. The weasel is much smaller than the stoat, and you can tell it at once by its tail, which is entirely red; that of the stoat has a black tip. But it is getting late and we must hasten home.

WALK III.

MAY.

To-day we will go and hunt for sticklebacks' nests; as it is calm I think we shall have very little trouble in finding a few; a calm day should always be chosen, because to find the nests of these little fish it is necessary to have very sharp eyes, and to look very closely, and you know if there is much wind the water is ruffled, and then it is not easy to see objects in it. Let us start off, then, with bait-can, canvass-net, and two or three large-mouthed bottles, to that small, clear, shallow pond in Mr. Jervis's field, and see if we can bring home a few fish and eggs. "It will be great fun," said Willy, "and when we have caught the little fish we will bring them home and put them in my aquarium." There are three species of sticklebacks found in this country, the three-spined, the ten-spined, and the fifteen-spined--this last inhabits salt water. All three build nests, and show great care for their little brood. The nests of the three-spined species are those most generally known, though I dare say, if we search carefully in the drains on the moors, we shall be successful in finding a nest of the ten-spined fellow, or tinker, as he is sometimes called.

Here we are at the pond, how clear it is, and how beautifully green are the few patches of star-wort in the water! As the grass is quite dry we can all sit down so as to get our eyes as near to the water as possible; never mind a few crawling ants, May; if they bite you, I shall not feel it. Ah! do you see that little fellow with crimson breast and eyes like emeralds? He sees us, for look how disturbed he seems; now he darts away and hides under a weed, but soon returns to the same spot; it is pretty certain he has a nest close by. I will put my walking-stick into the water near him. Well, actually, the brave little fellow is not the least frightened; see, he bunts his nose against the stick, and is very angry; he is afraid of some danger to his nest--this makes him so bold. Now I have made out where the nest is, it is close under him; do you see a few small holes in the mud at the bottom of the water? No, you don't see anything; well, then, give me my stick and I will point them out. There now, do you see what I mean? Yes, you do; that is all right. "Let us get the nest out of the water," said Jack. Have patience; let us watch what the fish is doing; see, he is busy fanning away with his tiny fins directly over the nest. "What is he doing that for?" said Willy. The quick movements of his fins bring fresh currents of water to the eggs or little fry that may be within. Ah! did you see that? another fish came near the nest; how furiously our brave "soldier" charged him; how quickly the intruder retired! I do not think he will dare to approach so near again for a long time, for those sharp spines on the under side of the soldier are like a couple of bayonets and can inflict serious wounds. Let us leave this nest for a time and try to find some more. Now that you have once seen a nest, you will not have much difficulty in finding others. Willy soon found another nest; "just look," he said, "there are a lot of the tiniest little things close to the nest." Yes, indeed, so there are; the eggs have hatched, and these are the little fry; there is Father Stickles quite proud of his numerous family, and quite ready to fight for them should any enemy be rash enough to intrude, for you must know that sticklebacks, like many other fish, do not object to eat the young fry of their neighbours, and if the parent there--it is the male only that is the protector--were to be removed, a hungry pack of other sticklebacks would crowd around and make sad havoc amongst that happy little family. I remember some years ago having once taken a father stickleback away from his nest, and, after putting him in my collecting bottle, I sat down to watch the result. Soon an invading army of other sticklebacks approached and attacked the nest for the purpose of getting at the clusters of eggs it contained. They pulled it about sadly, till I began to be sorry for what I had done. I returned the captive-parent to the water; at first he hardly knew where he was, and seemed confused, the result, no doubt, of his confinement in the bottle; but he was not long in coming to himself--he remembered his nest and the treasures it contained; he saw that devastating army all around it, and, summoning all his courage, the soldier-parent began an attack, now rushing at one and now at another enemy, till he was left alone on the battle-field, having thus gained, single-handed, a glorious victory indeed.

Well, we will take this one home, with nest and eggs it contains. You see the nest is a mass of tangled grass roots and other weeds; now that it is out of the water it is a shapeless mass. However, here is a cluster of pinkish eggs, and if you look closely you will see two little specks in each egg; so that the fish is being formed, for these are the little thing's eyes. You can see, too, the tiny things jerking their tails about every now and then. It is most interesting to watch the care the parent takes of his little ones when hatched. Some few years ago I put a male stickleback in a basin of water in charge of his nest. When the young ones were hatched it was most curious to notice his anxiety for their welfare. Of course young sticklebacks, like young children, are of an inquisitive turn of mind, and apt to play truant too occasionally; but should some little fellow wander too far from the nest, Father Stickles hurries after him, takes the little truant in his mouth, and spits him out right over the nest. This I repeatedly witnessed myself, and I have no doubt you will be able to see the same thing yourselves.

"Are not sticklebacks quarrelsome little fish?" asked Willy. Yes, they are very fond of fighting, and they are so bold that they do not fear any enemy, whatever his size. I once kept a small pike, about ten inches long, in an aquarium, into which I also introduced five or six sticklebacks. I suppose the pike did not much like the look of the prickles or spines, for he did not eat the fish. Once I saw him make the attempt, but after getting Master Stickles into his mouth, he quickly threw him out again, not relishing, I suppose, the _sauce piquante_ of the spines. The sticklebacks were really masters; they tormented Mr. Pike dreadfully; first one would take a bite at his tail, and then another, till the tail had a woful expression indeed; so I turned the pike into a pool of water, and I dare say the _retail_ business has long ere this been completed.

"Are there any other kinds of fish," asked Willy, "that make nests and take care of their young ones like the three species of sticklebacks?" Yes, there are several kinds of fish which do so, but no other British fresh-water kinds, I believe. There is the salt-water _Lumpsucker_, a fish of strange form and brilliant colour--you know the pickled specimen in my study--whose young soon after birth fix themselves to the sides and on the back of their male parent, who sails, thus loaded, away to deeper and more safe retreats. There are the long pipe-fishes, the males of which possess each a singular pouch on the tail; in this the eggs of the female are deposited and matured; the young ones occasionally leave their strange abode, and after swimming about for a time return to it again, reminding us in this respect of the kangaroos and opossums amongst mammalia. There are also fish which inhabit the rivers of Demerara which make nests and show great attachment to their young ones, and I dare say several other fish will be found to do the same.

"Oh! papa, do look here; as I was turning over this bit of flat tile I saw in the water I found a creature something like a leech, and on raising it up I saw what looks like a quantity of the animal's eggs, and she seems to be sitting upon them as a hen upon her eggs." All right, Jack; let me look, I dare say it is one of the snail-leeches. Yes, to be sure it is, and here are the eggs which the creature carefully covers with her body, and upon which she will sit till the young ones are formed; the small brood, sometimes one hundred and fifty or more in number, then attach themselves to the under surface of the parent, and are carried about wherever she goes. There are various species of this interesting family; all are inhabitants of fresh water; some incubate or sit upon their eggs, others carry them about in a hollow formed by the contraction of the sides. They have a long tubular proboscis, by means of which they suck out the juices of pond-snails and other water creatures. These snail-leeches move along in the same way as the common horse-leech and the medicinal leech, namely, by fixing the head-part on to the surface of some substance in the water and then drawing the hinder part up to it; they then extend the head-portion and fix it upon another spot, again drawing up the other extremity. But the leeches, properly so called, have all red blood; that of the snail-leeches is colourless.

"Is the leech used to bleed people when they are ill ever found in the ponds of this country?" asked Willy. I believe it is rarely met with now-a-days; most of the leeches used in medicine are imported from Spain, Hungary, the south of France, and Algeria; many millions are brought every year to this country. The medicinal leech, was, however, once pretty common in the lakes and pools of the north of England. The poet Wordsworth introduces us to an old leech-gatherer lamenting the scarcity of the animals in the following lines:

"He with a smile did then his words repeat And said that gathering leeches far and wide He travelled; stirring thus about his feet The waters of the pool where they abide. Once I could meet with them on every side; But they have dwindled long by slow decay; Yet still I persevere and find them where I may."