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(Click for frequent words.) 60 David Wilcove 59 Andrew DeWoody 58 Justin Brashares 57 Jakob Vinther 57 Patricia Zaradic 57 Kim Raum Suryan 56 Oliver Pergams 55 Wikelski 55 black capped chickadee 55 Prof. Daniel Offen 55 Gerta Keller 54 evolutionary ecologist 54 Dr. Daniel Offen 54 auklets 54 Gregory Asner 54 Tabashnik 54 Scott Shalaway 54 Mark Hindell 54 Kay Bidle 54 Xenopus tropicalis 54 Xiangzhong Yang 53 Steven Reppert 53 Varanus bitatawa 53 white crowned sparrows 53 Hans Laufer 53 Brett Wiedmann 53 Fred Spoor 53 Heliconius 53 Svante Pääbo 53 fruitfly Drosophila 53 Hans Thewissen 53 Fernando Nottebohm 53 Cheryl Hayashi 53 molecular systematics 52 Paul Leberg 52 polychaete worms 52 drosophila 52 Dmitri Tymoczko 52 Leonid Kruglyak 52 Rabeling 52 Pasko Rakic 52 Caitlin O'Connell Rodwell 52 Zelenitsky 52 Chris Darimont 52 Mandyam Srinivasan 52 Todd Katzner 52 Wilcove 52 marsh wren 52 Neuroscience Laboratory 51 Peter Klimley 51 Nick Longrich 51 Gene Kritsky 51 Yanoviak 51 predator prey interactions 51 mammalogist 51 molecular phylogeny 51 NCEAS 51 Gunda Georg 51 Whit Gibbons 51 Christine Huffard 51 Jelle Atema 51 Bonnie Bassler 51 Richard Prum 51 avian ecology 51 Shripad Tuljapurkar 51 Kristin Laidre 51 Konrad Lorenz 51 Greengard lab 51 long beaked echidna 51 Calsbeek 51 parasitoid wasp 51 brown creeper 51 brown hyena 51 Daniel Rokhsar 51 Indraneil Das 51 Bernd Heinrich 51 mammal ecologist 51 Randy Jirtle 51 Jill Pruetz 50 Andrew Balmford 50 Natalia Rybczynski 50 Dirk Brockmann 50 Jurgen Rehm 50 Alexander Todorov 50 Frank Mazzotti 50 PhD postdoctoral 50 Andrew Derocher 50 Leach storm petrels 50 Hogenesch 50 Ferenc Krausz 50 Pikaard 50 macroinvertebrate 50 Ambystoma 50 part sturgeon wrangler 50 Dee Boersma 50 Demian Chapman 50 Barbara Sahakian 50 Ruby throated Hummingbird 50 Barry Sinervo 50 Pocket gophers 50 Angelika Brandt 50 subadult 50 IFM GEOMAR 50 Nimbadon 50 UAF Geophysical Institute 50 ethologist 50 beak deformities 50 Aberdeen Oceanlab 50 wolf spiders 50 Rychard Bouwens 50 Bert Hölldobler 49 Evolutionary Anthropology Leipzig 49 Milford Wolpoff 49 salamanders frogs 49 Europasaurus 49 Black capped Chickadee 49 fruitflies 49 sooty shearwaters 49 Platynereis 49 mouse lemur 49 biometeorology 49 Duke Lemur 49 Brendan Godley 49 Synthesis NCEAS 49 Thierry Chopin 49 Laboratory MBL 49 vitellogenin 49 Frank Bisby 49 horned lizards 49 wood thrushes 49 Ajay Royyuru 49 Caenorhabditis 49 ostracods 49 Carl Woese 49 worm C. elegans 49 Paul Thornalley 49 Samuel Wickline 49 narwhals 49 Behavioral Ecology 49 Sociobiology 49 Shuguang Zhang 49 Niiler 49 carnivore species 49 Villy Christensen 49 Ixodes 49 Animal Cognition 49 Felicia Keesing 49 Jake Vander Zanden 49 Eske Willerslev 49 northern goshawk 49 Jake Socha 49 Stuart Pimm 49 Marco Festa Bianchet 49 Jana Vamosi 49 Nickolas Papadopoulos 49 Rupert Sheldrake 49 Jason Rentfrow 49 marine invertebrate 49 green alga 49 Bridget Stutchbury 49 Weddell seals 49 Argentine ant 49 Bleske Rechek 49 Dan Cristol 49 Tübingen Germany 49 giant squid Architeuthis 49 Amro Zayed 49 Adélie penguins 49 semipalmated sandpiper 48 Tony Wyss Coray 48 Noah Fierer 48 microbial ecologist 48 Cognitive Evolution 48 Dr. Randy Jirtle 48 NestWatch 48 Antonio Lanzavecchia 48 Darwin finches 48 Lee Grismer 48 Stephen Pacala 48 gall wasps 48 Dendrochronology 48 willow flycatcher 48 Harry Ostrer 48 Weiqing Han 48 toothed whales 48 Per Ahlberg 48 spiders scorpions 48 developmental biologist 48 Matthew Meselson 48 Institute MBARI 48 Hagan Bayley 48 insects crustaceans 48 Scripps Oceanography 48 Hod Lipson 48 Doron Behar 48 neotropical 48 Red shouldered hawks 48 behavioral neuroscientist 48 red breasted nuthatch 48 Thomas Jessell 48 Gamma ray burst 48 green anole 48 sticklebacks 48 behavioral ecologist 48 Stephen Brusatte 48 Limulus 48 Isaac Wirgin 48 Dolph Schluter 48 Kerstin Lindblad Toh 48 Susanne Shultz 48 Qi Zhou 48 endangered amphibians 48 Stephen Palumbi 48 insect ecologist 48 warbling vireo 48 Klaus Lackner 48 Andrew Rambaut 48 Christiane Volhard 48 Swainson thrushes 48 Keerti Rathore 48 Diego Pol 48 Manx shearwaters 48 Nir Barzilai 48 planarian 48 mosasaurs 48 Tibshirani 48 bioacoustics 48 red colobus 48 Anna hummingbird 48 monk parakeet 48 Ernst Mayr 48 Aydogan Ozcan 48 Justin Halberda 48 Andrea Manica 48 Ellen Stofan 48 Added Ron O'Dor 48 opossum shrimp 48 Peter Savolainen 48 Jorge Dubcovsky 48 corvid 48 ruddy turnstone 48 Nigel Raine 48 Randy Schekman 48 Ira Leifer 48 evolutionary geneticist 48 Mate Adamkovics 48 J. Todd Arnedt 48 saw whet owls 48 stickleback 48 Behavioural Ecology 48 restriction Alor 48 paleobiologist 48 evolutionary anthropology 48 biologist 48 silk moth 48 Manolis Kellis 48 Erich Jarvis 48 Joshua Plotnik 48 Kate Trinajstic 48 JoAnn Burkholder 48 Aquatic Toxicology 48 Dr. Masashi Yanagisawa 48 Ichthyostega 48 Microraptor gui 48 called Abydosaurus mcintoshi 48 Lynn Margulis 48 Gastrich 48 bar tailed godwits 48 grasshopper sparrow 48 jawless fish 47 Samer Hattar 47 Aleksandr Noy 47 rhinoceros auklets 47 Grover Krantz 47 Biological Conservation 47 Robert Vrijenhoek 47 Systematic Zoology 47 muriqui 47 mammalogy 47 African clawed frog 47 Bullock oriole 47 Mathias Treier 47 rufous hummingbirds 47 Molly Lutcavage 47 Caroline Van Hemert 47 Detlev Arendt 47 white winged scoter 47 Isle Royale wolf 47 Richard Lenski 47 Ecology Evolution 47 elephant shrew 47 black legged kittiwakes 47 Amato Giaccia 47 cichlid species 47 USGS ecologist 47 woodrat 47 Zebra mussel 47 red crossbills 47 Emily Oken 47 Nicholas Longrich 47 Maria Karayiorgou 47 Golet 47 cinnamon teal 47 highland mangabey 47 Evan Eichler 47 Qiang Fu 47 Thatje 47 endangered marsupials 47 Kay Tee Khaw 47 invertebrate animals 47 Elizabeth Lonsdorf 47 Elizabeth Hadly 47 Benjamin Libet 47 Roland Kays 47 Claudio Campagna 47 Bierregaard 47 Marzluff 47 Marlene Zuk 47 Burmese Pythons 47 teleost fish 47 Greger Larson 47 kipunji 47 Emmanuel Mignot 47 Walter Tschinkel 47 Eastern phoebe 47 Samuel Strober 47 Hublin 47 Mark Westneat 47 Huijser 47 Andreas Heinrich 47 vertebrate paleontologist 47 Daniel Nettle 47 Shuhai Xiao 47 tadpole shrimp 47 & Policy IGSP 47 yellow bellied marmot 47 harvester ants 47 Rosbash 47 molecular phylogenetic 47 Jeremy Nathans 47 Atul Butte 47 Biology Letters 47 Rokhsar 47 Aedes aegypti 47 UCSB Neuroscience 47 whale scat 47 Karolinska Institutet Stockholm Sweden 47 Arpad Vass 47 Large Pelagics Research 47 Lars Chittka 47 burying beetle 47 red necked grebes 47 Kutluk Oktay 47 Irva Hertz Picciotto 47 Jean Thie 47 terrestrial mammals 47 Martin Krkosek 47 palila 47 migratory habits 47 Rolf Halden 47 YV Jhala 47 Janet Monge 47 ichthyology 47 Robert Hueter 47 Dario Floreano 47 yellowhead 47 Jay Belsky 47 ovenbird 47 Pittendrigh 47 Andreas Muenchow 47 Rami Burstein 47 veterinary biosciences 47 Daryl Bem 47 horseshoe crab 47 fisheries ecologist 47 Kathy Belov 47 Brian Breidert 47 cicada killers 47 Applied Biodiversity 47 Dermochelys coriacea 46 Loggerhead turtles 46 Hamish Pritchard 46 Evolutionary Biology 46 macro invertebrates 46 Erol Fikrig 46 Emma Hitt 46 Jianyu Huang 46 Joan Roughgarden 46 Alan Cowman 46 Kew Jodrell Laboratory 46 plant Arabidopsis thaliana 46 Duane Froese 46 yellow throated warbler 46 Vertebrate Zoology 46 Galapagos penguins 46 Dora Biro 46 tiny single celled 46 Caretta caretta 46 Eran Segal 46 Vertebrates 46 pocket gophers 46 Dan Werthimer 46 Tribolium 46 Carcharhinus 46 Hollmen 46 Mytilus 46 Gerald Mayr 46 amphipods 46 Richard Wrangham 46 Jonathan Schooler 46 Koobi Fora 46 biologists 46 Caspian tern 46 moth caterpillar 46 Herbaria 46 Keith Warnke DNR 46 J Craig Venter 46 journal Behavioural Ecology 46 Frank Sulloway 46 eastern meadowlarks 46 Hendrik Poinar 46 Brian Lezina state 46 Harold D. Stolovitch 46 Chris Milensky 46 computational biologist 46 Valerius Geist 46 toadfish 46 electron microscopist 46 birds amphibians reptiles 46 Liz Slooten 46 crinoids 46 ant colonies 46 Chittka 46 Brad Duchaine 46 Leif Kullman 46 backboned animals 46 geolocators 46 Pinta Island 46 Thure Cerling 46 Ivory billed woodpeckers 46 Makovicky 46 Richard O. Prum 46 pygmy possum 46 brevirostris 46 journal Behavioral Ecology 46 Dr. Gianni Belcaro 46 Bruce Spiegelman 46 spookfish 46 Shira Gabriel 46 gall wasp 46 Nadrian Seeman 46 mangabey 46 Nicholas Kotov 46 americanus 46 Don Freiday 46 sengi 46 northern fulmars 46 wild canids 46 Zeb Hogan 46 Macklis 46 Gregory Skomal 46 Hanski 46 Pristine habitat 46 eastern cougar subspecies 46 leucistic 46 boreal owl 46 akepa 46 Orang utans 46 horned larks 46 freshwater invertebrates 46 gopher frog 46 unhatched eggs 46 Applied Animal Behaviour 46 Simon LeVay 46 George Preti 46 Mizejewski 46 Zhao Xijin 46 Casadevall 46 Henshilwood 46 Greg Finstad 46 Daan Kromhout 46 tufted puffins 46 Reese Halter 46 star nosed mole 46 Polar Biology 46 Geoffrey Schladow director 46 Edward Drinker Cope 46 intersex fish 46 CSIRO Wealth 46 choanoflagellates 46 Garter snakes 46 Stuart Pimm Duke 46 shortnose sturgeon 46 evolutionary adaptations 46 Trembanis 46 Bachman sparrow 46 Vance Vredenburg 46 DeWoody 46 smooth cordgrass 46 Eric Dinerstein 46 BioDiversity Research Institute 46 Hugh Possingham 46 isopod 46 Sally McBrearty 46 melanogaster 46 Timothy Searchinger 46 snailfish 46 Raptorex kriegsteini 46 yellow billed cuckoo 46 dunlins 46 sandbar sharks 46 Loren Rieseberg 46 Vertebrate 46 Max Plank 46 Comparative Zoology 46 Crittercam 46 brood parasitism 46 white winged crossbill 46 Simin Nikbin Meydani 46 tuataras 46 Semlitsch 46 pea aphids 46 Walter Jetz 46 Pacific hake whitefish 46 sanderlings 46 morphological traits 46 Phragmites australis 45 Dava Newman 45 Adam Backlin 45 Juan Carlos Izpisúa Belmonte 45 Yoel Fink 45 Poinar 45 common merganser 45 Randy Kochevar 45 pied billed grebes 45 Don Ganem 45 Jonathan Levav 45 Brusatte 45 molecular biology genetics 45 Asilisaurus 45 marine invertebrates 45 Roland Burgmann 45 toothed whale 45 Louis Zeidberg 45 professors emeriti 45 reproductive physiology 45 Larry Herrighty 45 aquatic insect 45 Babak Parviz 45 Donald Ingber 45 Dr. Ajit Varki 45 paleobiologists 45 Thomas Tuschl 45 black chinned hummingbird 45 Lynn Jorde 45 Piping plover 45 Ehud Shapiro 45 Robert Blelloch 45 École Polytechnique Fédérale de 45 Jorn Hurum 45 Eric Rimm 45 Russ Tedrake 45 PRBO 45 lepidopterist 45 avid bird watcher 45 Izpisúa Belmonte 45 metapopulation 45 pocket gopher 45 Hugh MacIsaac 45 Ted Pietsch 45 Capt. Chop Lege 45 Craig Koppie 45 Frank von Hippel 45 Westneat 45 coriacea 45 honeycreepers 45 boreal owls 45 Julien Sobrier senior 45 Azim Surani 45 Marc Bekoff 45 Aravinda Chakravarti Ph.D. 45 Kaj Blennow 45 foraging habitats 45 Dubcovsky 45 HHMI investigator 45 Maryse Bouchard 45 BY EDWARD ZERIN 45 Sinervo 45 zebra finch genome 45 leatherback turtle 45 ocean sunfish 45 Maestripieri 45 gopher frogs 45 Indohyus 45 predator prey relationship 45 Galapagos tortoises 45 biogeography 45 single celled microbes 45 Sean Van Sommeran 45 greylag geese 45 Woese 45 Leif Andersson 45 isopods 45 Magellanic Penguins 45 waterbird 45 Georges Cuvier 45 Johannes Lehmann 45 UW Applied Physics 45 vesper sparrow 45 Clifford Saper 45 Balaenoptera 45 evolutionary biologist 45 Burguess 45 Rebecca Garten 45 orb weaving spider 45 Chris Pincetich 45 Nalini Nadkarni 45 Dariusz Leszczynski 45 Cees Dekker 45 Aplysia 45 canebrake rattlesnakes 45 Pygmy hippos 45 microbial ecology 45 Ron O'Dor 45 finback 45 Michael Egholm 45 daphnia 45 Victor Velculescu MD Ph.D. 45 Pruetz 45 PNAS paper 45 P. Dee Boersma 45 wandering albatrosses 45 rusty blackbird 45 Priyamvada Natarajan 45 Christopher Henshilwood 45 male lampreys 45 George Wittemyer 45 Blaire Van Valkenburgh 45 banded birds 45 Briggler 45 Rachel Herz 45 cone snails 45 phoebes 45 lion mane jellyfish 45 gorilla chimpanzee 45 tanager 45 red throated loons 45 yellow billed magpies 45 Tad Pfeffer 45 Chunlei Guo 45 red billed tropicbird 45 Nancy Prouty USGS 45 Tamas Horvath 45 Carolyn Edds 45 frogs salamanders 45 Klaus Zuberbuhler 45 CU Boulder Cooperative 45 bufo 45 Shahin Rafii 45 Laidre 45 Rhincodon typus 45 New Caledonian crows 45 avian species 45 HARBOR BRANCH 45 Lamont Doherty 45 redshank 45 scalloped hammerhead shark 45 freshwater jellyfish 45 famed naturalist 45 Mark Tarnopolsky 45 common eiders 45 Primatologist 45 fur bearer 45 Peter Kareiva 45 tunicate 45 whimbrels 45 Hans Deeg 45 bdelloid rotifers 45 microbats 45 merlins 45 Laura Niklason 45 Richard Slemons 45 Coren Apicella 45 wintering bald eagles 45 Evolutionary Studies 45 white ibises 45 Charles Musyoki 45 Craighead Beringia South 45 Sten Grillner 45 akekee 45 Kary Mullis 45 cognitive neuroscientist 45 grasshopper sparrows 45 ethology 45 Alejandro Portes 45 Sei whales 45 Ron O'Dor senior 45 marine ecologists 45 spadefoot toad 45 surf scoters 45 Leatherback sea turtles 45 Prudic 45 bryozoan 45 Gambel quail 45 Lance Barrett Lennard 45 Miguel Altieri 45 Jianjun Yin 45 fairy tern 44 Hideyuki Okano 44 UC Metabolic Diseases 44 Cynda Crawford 44 evolutionary anthropologist 44 black necked stilt 44 finback whales 44 Swainson hawks 44 Christiane Reitz 44 Galerucella beetles 44 Inez Fung 44 Justus Liebig University 44 Neotropical 44 legless lizard 44 Kruetzen 44 invertebrate zoology 44 razorbill 44 tammar wallaby 44 Kevin Padian 44 eiders 44 gorillas chimps 44 Barrow Goldeneye 44 Marc van Roosmalen 44 brook lamprey 44 blennies 44 Alice Crites 44 Bohart Museum 44 Forest Rohwer 44 Meg Urry 44 red winged blackbird 44 Greg Skomal 44 Genomics Laboratory 44 Bruce Tabashnik 44 marbled salamander 44 Evolutionary Biologist 44 evolutionary genetics 44 D. Sabapathy 44 zoologist 44 Heinz Maier Leibnitz 44 Tanya Shenk 44 Breeding Bird Survey 44 Peter Makovicky 44 parasitoid wasps 44 Moya Sola 44 Aureococcus 44 Eisenia 44 Veterinary Microbiology 44 PCMM IDI 44 Dr. William Karesh 44 Prof. Eilam 44 Karolinska Institutet Sweden 44 Schkade 44 teleost 44 Manfred Kayser 44 Meri Firpo 44 green darner 44 archaic ungulates 44 Josefino Comiso 44 local Agta tribesmen 44 Ashley Montagu 44 purple sandpipers 44 Rare albino 44 Richard Lewontin 44 olive ridley 44 parasitic insect 44 Gouldian finch 44 Willie Suchy 44 Atlantic sharpnose 44 Captive bred 44 yellow warblers 44 meadow voles 44 William Happer 44 Satoshi Kanazawa 44 uncollared 44 killifish 44 biogeochemist 44 blacknose 44 Biological Anthropology 44 journal Animal Behaviour 44 biological anthropology 44 Paranthropus robustus 44 India ZSI 44 nestbox 44 Shirihai 44 Sabine Bahn 44 Molecular biologists 44 mussel larvae 44 Xing Xu 44 Hans Geiger 44 Hardisky 44 ambrosia beetle 44 nymphal ticks 44 upland sandpipers 44 Yanega 44 Lian Pin 44 Evolutionary biologist 44 FWRI 44 Tsunemi Kubodera 44 Boisserie 44 Claes Wahlestedt 44 Werthimer 44 Murrelets 44 Anthony Barnosky 44 hawks eagles 44 semipalmated sandpipers 44 Saw whets 44 seabird nesting 44 Leonard Guarente 44 Ludek Zurek 44 green alga Chlamydomonas 44 mammals 44 Pergams 44 phylogeographic 44 common redpoll 44 Integrative Biology 44 Straneo 44 leatherback sea turtle 44 Ecology Letters 44 Zu Shuxian 44 toad tadpoles 44 Yellowstone cutthroats 44 ETH Zürich 44 Developmental Psychobiology 44 godwits 44 seals walrus 44 Cardiovascular Epidemiology 44 Rany Shamloul 44 indigo snake 44 Mesozoic mammals 44 Makiko Sato 44 Matteo Garbelotto 44 cottontail rabbits 44 By Eva Norlyk 44 Michael F. Leitzmann 44 Robert Trivers 44 Clifford Nass 44 otoliths 44 Zootaxa 44 crocodilian species 44 Steven Austad 44 Hans Larsson 44 northern harrier 44 necropsied 44 eared grebe 44 Sunda clouded leopard 44 sharptail 44 bonneted bat 44 Michael Studinger 44 Dolores Piperno 44 Shepson 44 Wytham Woods 44 Nikku Madhusudhan 44 fossilized creatures 44 Marc Weisskopf 44 Krkosek 44 Mapusaurus roseae 44 K. Ullas Karanth 44 Fred Grassle 44 Senckenberg Research Institute 44 Nina Jablonski 44 Horseshoe crabs 44 pintail ducks 44 Leschine 44 Rainer Blatt 44 submersible Alvin 44 moray eel 44 A. ramidus 44 Marin Soljacic 44 Dr. Marco Iacoboni 44 Robert Ovetz 44 ivory gulls 44 Synte Peacock 44 undated handout illustration 44 spined stickleback 44 bird banders 44 Eric Hoffmayer 44 Winston Seiler 44 Littnan 44 coniferous forests 44 microbial pathogenesis 44 cytosine methylation 44 damselflies 44 Welbergen 44 Marco Iacoboni 44 Lovich 44 Pakrasi 44 Freshwater Biology 44 rusty blackbirds 44 sabertooth cat 44 Avner Vengosh 44 Andrew Meltzoff 44 platypuses 44 Toolik Lake 44 False killer whales 44 Albert Laszlo Barabasi 44 Larry Van Daele 44 harlequin duck 44 Nikhil Koratkar 44 Galapagos finches 44 Ariela Keysar 44 insectivores 44 Sankar Chatterjee 44 Benfey 44 Laurie Marker 44 Ullas Karanth 44 ptarmigans 44 Bailey Serres 44 CoECRS 44 Natalie Mahowald 44 Bornean clouded leopard 44 biological anthropologist 44 Petter Kristensen 44 Daniel Geschwind 44 Frits Rosendaal 44 Muséum National 44 Laurence Tiley 44 eastern meadowlark 44 Steller sea eagle 43 Markram 43 Raphael Kudela professor 43 Ray Jayawardhana 43 Lammertink 43 Willerslev 43 stinging tentacles 43 Barred owls 43 yellow bellied marmots 43 Jonathan Haidt 43 biogeographic 43 V. Ramanathan 43 Mullard Space Sciences 43 Kipunji 43 aquatic invertebrates 43 Kenneth Noller 43 Dernburg 43 Henk Brinkhuis 43 Randall Irmis 43 Brydes whales under 43 Gaetano Di Achille 43 balsam poplar 43 MaryFran Sowers 43 Behrenfeld 43 spruce grouse 43 Wylie Rosett 43 dusky shark 43 bird bander 43 Finarelli 43 cactus wrens 43 von Frisch 43 Pontzer 43 Ewan Birney 43 Kirtland warblers 43 Keith Hamer 43 lark bunting 43 Ecological Analysis 43 Caspian terns 43 homosexual necrophilia 43 Patuxent Wildlife 43 Carel van Schaik 43 Max Delbruck Center 43 Svante Paabo 43 Mikucki 43 zebra mussel larvae 43 garter snakes 43 Tomas Prolla 43 Giulio Tononi 43 Cassin auklets 43 Cognitive Neurosciences 43 harpy eagle 43 Comparative Medicine 43 Pelagic Shark Research 43 Seymour Benzer 43 spotted sandpipers 43 Lewis Ziska 43 tiger salamanders 43 Biogeochemistry 43 Del Frate 43 martens 43 Black capped chickadees 43 red mysid 43 Andrew Dillin 43 quantum astrophysicist 43 Savage Rumbaugh 43 Robert Sapolsky 43 Kaja Brix 43 flatfishes 43 Philip Benfey 43 roboticist 43 pinniped 43 Sandhage 43 Humpback whale 43 common murres 43 Geophysical Fluid Dynamics