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NOAA Technical Report NMFS CIRC-396

Whales, Dolphins, and Porpoises of the Western North Atlantic

A Guide to Their Identification

STEPHEN LEATHERWOOD, DAVID K. CALDWELL, and HOWARD E. WINN

with special assistance by William E. Schevill and Melba C. Caldwell

SEATTLE, WA AUGUST 1976

UNITED STATES DEPARTMENT OF COMMERCE Elliot L. Richardson, Secretary / NATIONAL OCEANIC AND / ATMOSPHERIC ADMINISTRATION / Robert M. White, Administrator / National Marine / Fisheries Service / Robert W. Schoning, Director

For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402

Stock No. 003-020-00119-0 / Catalog No. C 55.13: NMFS CIRC-396

PREFACE

In March 1972, the Naval Undersea Center (NUC), San Diego, Calif. in cooperation with the National Marine Fisheries Service (NMFS), Tiburon, Calif. published a photographic field guide--_The Whales, Dolphins and Porpoises of the Eastern North Pacific. A Guide to Their Identification in the Water_, by S. Leatherwood, W.E. Evans, and D.W. Rice (NUC TP 282). This guide was designed to assist the layman in identifying the cetaceans he encountered in that area and was intended for use in two ongoing whale observer programs, NUC's Whale Watch and NMFS's Platforms of Opportunity. The rationale of these programs was that since oceanographers, commercial and sport fishermen, naval personnel, commercial seamen, pleasure boaters, and coastal aircraft pilots together canvas large areas of the oceans which scientists specializing in whales (cetologists) have time and funds to survey only occasionally, training those persons in species identification and asking them to report their sightings back to central data centers could help scientists more clearly understand distribution, migration, and seasonal variations in abundance of cetacean species. For such a program to work, a usable field guide is a requisite. Because the many publications on the whales, dolphins, and porpoises of this region were either too technical in content or too limited in geographical area or species covered to be of use in field identification, and because conventional scientific or taxonomic groupings of the animals are often not helpful in field identification, the photographic field guide took a different approach. Instead of being placed into their scientific groups, species were grouped together on the basis of similarities in appearance during the brief encounters typical at sea. Photographs of the animals in their natural environment, supplemented by drawings and descriptions or tables distinguishing the most similar species, formed the core of the guide.

Despite deficiencies in the first effort and the inherent difficulties of positively identifying many of the cetacean species at sea, the results obtained from the programs have been encouraging. Many seafarers who had previously looked with disinterest or ignorance on the animals they encountered became good critical observers and found pleasure in the contribution they were making. The potential for the expansion of such observer programs is enormous.

Because of these initial successes and the large number of requests for packets from persons working at sea off the Atlantic coast of North America, this guide was planned. Many of the errors and deficiencies of the Pacific Guide have been corrected, and the discussions of the ranges of many of the species have been expanded with considerations of the major oceanographic factors affecting their distribution and movements. While the present volume, like the Pacific Guide, is intended as an aid to the identification of living animals at sea, new materials have been provided to aid in the identification and reporting of stranded specimens, a major source of data and study material for museums. This new dimension is expected to assist the U.S. National Museum, various regional museums, and other researchers actively collecting cetacean materials for display and study in the implementation of their stranded animal salvage programs. Through a cooperative effort of this kind, the best possible use can be made of all materials that become available.

As a part of continuing research, this guide will be revised whenever possible. Suggestions for its improvement will at all times be welcome.

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Funds for the preparation of this guide were provided by a grant to Stephen Leatherwood from the Platforms of Opportunity Program, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Tiburon, Calif., Paul Sund, Coordinator.

CONTENTS

Introduction 1 Classification of cetaceans 1 Dolphin or porpoise 5 Organization of the guide 5 How to use the guide 7 To identify animals at sea 7 To identify stranded animals 7 To record and report information 7 Directory to species accounts: Large whales: With a dorsal fin 10 Without dorsal fin 13 Medium-sized whales: With a dorsal fin 14 Without dorsal fin 15 Small whales, dolphins, and porpoises with a dorsal fin 16 Species accounts: Large whales with a dorsal fin: Blue whale 19 Fin whale 26 Sei whale 32 Bryde's whale 37 Humpback whale 40 Large whales without dorsal fin: Bowhead whale 49 Right whale 52 Sperm whale 57 Medium-sized whales with a dorsal fin: Minke whale 63 Northern bottlenosed whale 67 Goosebeaked whale 70 Other beaked whales 74 True's beaked whale 77 Antillean beaked whale 78 Dense-beaked whale 80 North Sea beaked whale 82 Killer whale 84 False killer whale 88 Atlantic pilot whale 91 Short-finned pilot whale 94 Grampus 96 Medium-sized whales without dorsal fin: Beluga 99 Narwhal 102 Small whales, dolphins, and porpoises with a dorsal fin: Atlantic spotted dolphin 104 Bridled dolphin 108 Spinner dolphin 110 Striped dolphin 113 Saddleback dolphin 116 Fraser's dolphin 120 Atlantic white-sided dolphin 123 White-beaked dolphin 126 Atlantic bottlenosed dolphin 128 Guiana dolphin 132 Rough-toothed dolphin 135 Pygmy killer whale 138 Many-toothed blackfish 142 Pygmy sperm whale 144 Dwarf sperm whale 148 Harbor porpoise 150 Acknowledgments 152 Selected bibliography 152

Appendix A, Tags on whales, dolphins, and porpoises 154

Appendix B, Recording and reporting observations of cetaceans at sea 160

Appendix C, Stranded whales, dolphins, and porpoises; with a key to the identification of stranded cetaceans of the western North Atlantic 163

Appendix D, Recording and reporting data on stranded cetaceans 169

Appendix E, List of institutions to contact regarding stranded cetaceans 171

The National Marine Fisheries Service (NMFS) does not approve, recommend or endorse any proprietary product or proprietary material mentioned in this publication. No reference shall be made to NMFS, or to this publication furnished by NMFS, in any advertising or sales promotion which would indicate or imply that NMFS approves, recommends or endorses any proprietary product or proprietary material mentioned herein, or which has as its purpose an intent to cause directly or indirectly the advertised product to be used or purchased because of this NMFS publication.

Whales, Dolphins, and Porpoises of the Western North Atlantic

A Guide to Their Identification

STEPHEN LEATHERWOOD,[1] DAVID K. CALDWELL,[2] and HOWARD E. WINN[3]

with special assistance by William E. Schevill[4] and Melba C. Caldwell[2]

[Footnote 1: Biomedical Division, Undersea Sciences Department, Naval Undersea Center, San Diego, CA 92132.]

[Footnote 2: Biocommunication and Marine Mammal Research Facility, C. V. Whitney Marine Research Laboratory of the University of Florida, St. Augustine, FL 32084.]

[Footnote 3: Graduate School of Oceanography, University of Rhode Island, Kingston, RI 02881.]

[Footnote 4: Woods Hole Oceanographic Institution, Woods Hole, MA 02543 and Museum of Comparative Zoology, Harvard University, Cambridge, MA 02138.]

ABSTRACT

This field guide is designed to permit observers to identify the cetaceans (whales, dolphins, and porpoises) they see in the western North Atlantic, including the Caribbean Sea, the Gulf of Mexico, and the coastal waters of the United States and Canada. The animals described are grouped not by scientific relationships but by similarities in appearance in the field. Photographs of the animals in their natural environment are the main aids to identification.

A dichotomized key is provided to aid in identification of stranded cetaceans and appendices describe how and to whom to report data on live and dead cetaceans.

INTRODUCTION

All whales, dolphins, and porpoises belong to an order or major scientific group called the Cetacea by scientists. They are all mammals (air-breathing animals which have hair in at least some stage of their development, maintain a constant body temperature, bear their young alive, and nurse them for a while) which have undergone extensive changes in body form (anatomy) and function (physiology) to cope with a life spent entirely in the water. The breathing aperture(s), called a blowhole or blowholes, has (have) migrated to the top of the head to facilitate breathing while swimming; the forward appendages have become flippers; the hind appendages have nearly disappeared, they remain only as small traces of bone deeply imbedded in the muscles. Propulsion is provided by fibrous, horizontally flattened tail flukes.

Scientists recognize two suborders of living cetaceans: the whalebone whales, suborder Mysticeti, and the toothed whales, suborder Odontoceti. The two groups are separated in the following ways:

BALEEN OR WHALEBONE WHALES. These animals are called whalebone whales because when fully formed instead of teeth they have up to 800 or more plates of baleen or whalebone depending from the roof of the mouth. They use these plates to strain their food, which consists of "krill" (primarily small crustaceans) and/or small schooling fish, by taking water into the mouth and forcing it out through the overlapping fringes of the baleen plates. Baleen whales are externally distinguishable from toothed whales by having paired blowholes. There are eight species of baleen whales in the western North Atlantic, ranging in size from the minke whale (just over 30 feet [about 9.1 m])[5] to the blue whale (85 feet [25.9 m]).

[Footnote 5: Throughout this guide, measurements are given first in feet or inches, followed in parentheses by their equivalents in meters or centimeters. It is recognized that field estimates cannot be as precise as most of the conversions used.]

TOOTHED WHALES. Unlike the baleen whales, the toothed whales do have teeth after birth. The teeth vary in number from 2 to over 250, though they may sometimes be concealed beneath the gum. In addition, toothed whales have only a single blowhole. This group includes the animals commonly called dolphin or porpoise as well as some commonly called whales (for example, the sperm whale). There are currently about 30 species of toothed whales known from the western North Atlantic, ranging in maximum adult size from the common or harbor porpoise, which is approximately 5 feet (1.5 m) long, up to the sperm whale which reaches a length of 68 feet (20.7 m). Several other species which are expected to be found in this region, though they have not yet been reported, are also included in this guide.

CLASSIFICATION OF CETACEANS

In addition to the two suborders (Mysticeti and Odontoceti), the cetacean order contains numerous families, genera, and species. Each of these groupings represents a progressively more specialized division of the animals into categories on the basis of similarities in their skulls, postcranial skeletons, and external characteristics. The discipline which concerns itself with naming an animal and assigning it to its appropriate scientific category is known as taxonomy. An example of the classification of a cetacean species is shown in the following:

SCIENTIFIC CLASSIFICATION OF THE ATLANTIC BOTTLENOSED DOLPHIN

Kingdom: Animalia all animals

Phylum: Chordata having at some stage a notochord, the precursor of the backbone

Subphylum: Vertebrata animals with backbones--fishes, amphibians, reptiles, birds, and mammals

Class: Mammalia animals that suckle their young

Order: Cetacea carnivorous, wholly aquatic mammals: whales, including dolphins and porpoises

Suborder: Odontoceti toothed whales as distinguished from Mysticeti, the baleen whales

Family: Delphinidae dolphins

Genus: Tursiops bottlenosed dolphins

Species: truncatus Atlantic bottlenosed dolphin

Modern taxonomy had its origin with the Swedish naturalist Linnaeus, whose tenth edition of the _Systema Naturae_ in 1758 forms the official starting point. Following Linnaeus, modern scientific names consist of two words, a generic name, which has an initial capital, and a species name, which rarely does, occasionally in botany (some species names deriving from a person's name are capitalized). Both names are usually of Latin origin (sometimes Greek) and are italicized or underlined. These scientific names are of particular importance because, although common names of species often are different in different countries or even in different regions of the same country, the scientific name remains the same. For example, the right whale is universally known as _Eubalaena glacialis_ though its common names include black right whale, nordcaper, sletbag, Biscay whale, and Biscayan right whale.

Although classification of many species is still in a state of flux, the classification of western North Atlantic cetaceans followed in this guide is as follows:

Page of synoptic account of the species

Order Cetacea

Suborder Mysticeti--Baleen whales

Family Balaenopteridae--Rorquals

_Balaenoptera acutorostrata_ Lacepede 1804 Minke whale 63

_Balaenoptera physalus_ (Linnaeus 1758) Fin whale 26

_Balaenoptera musculus_ (Linnaeus 1758) Blue whale 19

_Balaenoptera borealis_ Lesson 1828 Sei whale 32

_Balaenoptera edeni_ Anderson 1879 Bryde's whale 37

_Megaptera novaeangliae_ (Borowski 1781) Humpback whale 40

Family Balaenidae--Right whales

_Balaena mysticetus_ Linnaeus 1758 Bowhead whale 49

_Eubalaena glacialis_ (Borowski 1781) Right whale 52

Suborder Odontoceti--Toothed whales

Family Ziphiidae

_Mesoplodon bidens_ (Sowerby 1804) North Sea beaked whale 82

_Mesoplodon densirostris_ (Blainville in Dense-beaked Desmarest 1817) whale 80

_Mesoplodon europaeus_ (Gervais 1855) Antillean beaked whale 78

_Mesoplodon mirus_ True 1913 True's beaked whale 77

_Ziphius cavirostris_ G. Cuvier 1823 Goosebeaked whale 70

_Hyperoodon ampullatus_ (Forster 1770) Northern bottlenosed whale 67

Family Physeteridae

_Physeter catodon_ Linnaeus 1758 Sperm whale 57

_Kogia breviceps_ (Blainville 1838) Pygmy sperm whale 144

_Kogia simus_ (Owen 1866) Dwarf sperm whale 148

Family Monodontidae

_Monodon monoceros_ Linnaeus 1758 Narwhal 102

_Delphinapterus leucas_ (Pallas 1776) Beluga 99

Family Stenidae

_Steno bredanensis_ (G. Cuvier in Rough-toothed dolphin 135 Lesson 1828)

_Sotalia guianensis_ (P. J. van Guiana dolphin 132 Beneden 1864)

Family Delphinidae

_Peponocephala electra_ (Gray 1846) Many-toothed blackfish 142

_Feresa attenuata_ Gray 1874 Pygmy killer whale 138

_Pseudorca crassidens_ (Owen 1846) False killer whale 88

_Globicephala melaena_ (Traill 1809) Atlantic pilot whale 91

_Globicephala Gray 1846 Short-finned pilot whale 94 macrorhynchus_

_Orcinus orca_ (Linnaeus 1758) Killer whale 84

_Lagenorhynchus Gray 1846 White-beaked dolphin 126 albirostris_

_Lagenorhynchus acutus_ (Gray 1828) Atlantic white-sided dolphin 123

_Lagenodelphis hosei_ Fraser 1956 Fraser's dolphin 120

_Tursiops truncatus_ (Montagu 1821) Bottlenosed dolphin 128

_Grampus griseus_ (G. Cuvier 1812) Grampus 96

_Stenella longirostris_ Gray 1828 Spinner dolphin 110

_Stenella frontalis_ (G. Cuvier 1829) Bridled dolphin 108

_Stenella coeruleoalba_ (Meyen 1833) Striped dolphin 113

_Stenella plagiodon_ (Cope 1866) Spotted dolphin 104

_Delphinus delphis_ Linnaeus 1758 Saddleback dolphin 116

Family Phocoenidae

_Phocoena phocoena_ (Linnaeus 1758) Harbor porpoise 150

This tentative classification follows an unpublished list by W.E. Schevill and E.M. Mitchell currently under review. The scientific names are followed by the name of the individual who named the species and the year of naming, and then by the common name most often used in the western North Atlantic.[6] It may be noted that some of the authors are in parentheses. This indicates that though the species name has remained the same since the date of naming the species has since been assigned to another genus. Because the species are not arranged in taxonomic order in this field guide, the page of the synoptic account of each is provided in the column to the right.

[Footnote 6: Most common names are based on some characteristic of the species (e.g., spotted dolphin, striped dolphin, rough-toothed dolphin); others are the names of authors of the species (e.g., True's beaked whale) or of habitats or macrohabitats which they inhabit (e.g., North Sea beaked whale and harbor porpoise); the origins of some common names, however, are less obvious (e.g., dense-beaked whale), and of less use in field references.]

DOLPHIN OR PORPOISE