- Yak
- Yellowfin Tuna
- Yellowjacket
- Yellowtail Snapper
- Yellow Tang
- Yellow-bellied Marmot
- Yellow Warbler
- Yabby
- Yeti Crab
- Yellow-eyed Penguin
- Yellow Mongoose
- Yellowhammer
- Yaffle (Green Woodpecker)
- Yapok
- Yellow Crazy Ant
- Yellow Perch
- Yellow-billed Hornbill
- Yellow Swallowtail
- Yelkouan Shearwater
- Yellow Garden Spider
- Yacare Caiman
- Yellow-headed Amazon
- Yellow-breasted Chat
- Yellow-bellied Slider
- Yuma Myotis
