Thanks to all the artists involved (and their youtube uploaders), in order of appearance:

Screaming Monkeys of Parc Zoologique de Fréjus (MrGrumps84)
http://www.youtube.com/watch?v=weu-R_...

Screaming Monkeys of Virginia Zoo (babigurl6910)
http://www.youtube.com/watch?v=unCynR...

Medusa the Thumping Rabbit (pooopyscoopy)
http://www.youtube.com/watch?v=Wxb-hj...

Pixel the Thumping Rabbit (okiecompy)
http://www.youtube.com/watch?v=2sheqP...

A Stamping Rabbit (msatoru)
http://www.youtube.com/watch?v=fQOInY...

On The Sound of Snapping Shrimp - production by Michel Versluis, Barbara Schmitz, Anna Von Der Heydt and Detlef Lohse (Department of Physics, University of Twente and Department of Zoology, Technical University Munich)
(robertvinet)
http://www.youtube.com/watch?v=ONQlTM...

Cute Dog Screams "Elmo" (Coldarmy2007)
http://www.youtube.com/watch?v=2izsoL...

Psycho Woodpecker (NeilGrubb)
http://www.youtube.com/watch?v=7Ju7Ng...

Mooing Cow (edthened)
http://www.youtube.com/watch?v=T1_nZv...

Turtle Having an Orgasm (king12kong1212)
http://www.youtube.com/watch?v=xZKVoc...

Giant tortoises having fun (burkharaton)
http://www.youtube.com/watch?v=_sMFN6...

Tortoise having sex with a shoe (BAKESbbz)
http://www.youtube.com/watch?v=6R3BYC...

Tempest the Screaming Bald Eagle, Minnesota Zoo (bombalurina)
http://www.youtube.com/watch?v=g0A2mZ...

Bat's Echolocation Sonar (PiriniLelapa)
http://www.youtube.com/watch?v=roJRvn...

Howling Boxer Dog (joeblow33)
http://www.youtube.com/watch?v=tqD1AG...

Nau Oon The Noisy elephant (supatclub)
http://www.youtube.com/watch?v=_M7bcz...

Mishka the Talking Husky Dog - "I love you" (gardea23)
http://www.youtube.com/watch?v=qXo3NF...

Hadiah the Baby Sumatran Tiger Cub, courtesy of Woodland Park Zoo in Seattle (dahalcon)
http://www.youtube.com/watch?v=idRc_K...

Sheep says Baaaaa (andersporter)
http://www.youtube.com/watch?v=rooPPL...

"Goat Yells for Mom" (thombone)
http://www.youtube.com/watch?v=K1uMOL...

Henri The Pearl White legorn Rooster, crowing in the Morning (ginablackhawk)
http://www.youtube.com/watch?v=Fe_HtA...

Sweetheart the Humpback Whale and her calf Heartthrob (courtesy of TheOceaniaProject)
http://www.youtube.com/watch?v=WabT1L...

Nellie the Piano-Playing Pig (nelliestar2)
http://www.youtube.com/watch?v=S1dbAi...

Great Horned Owl Hooting (faerthen)
http://www.youtube.com/watch?v=AwEi6T...

North Albertan Barred Owl (CanadaWild)
http://www.youtube.com/watch?v=fppKGJ...

Whistling puppy (CA95207)
http://www.youtube.com/watch?v=lHAshi...

Screaming Tropical Monkey (KEPANATV)
http://www.youtube.com/watch?v=yUaAAO...

Screaming Cat Being Attacked By Dog (fleetphi)
http://www.youtube.com/watch?v=KRkBaa...

Ugly dog Makes Weird Noises (pharlap4 via bofunk.com)
http://www.youtube.com/watch?v=j3Cn7s...