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- YakLong-haired domesticated bovid
- Yam (vegetable)Edible starchy tuber
- YeastInformal group of fungi
- Yellow mongooseThe yellow mongoose (Cynictis penicillata), sometimes referred to as the red meerkat, is a
- Yellow perchSpecies of freshwater fish
- Yellow-bellied weaselThe yellow-bellied weasel (Mustela kathiah) is a species of weasel that inhabits pine fore
- Yellow-billed kingfisherThe yellow-billed kingfisher (Syma torotoro) is a medium-sized tree kingfisher.
- Yellow-footed antechinusThe yellow-footed antechinus (Antechinus flavipes), also known as the mardo, is a shrew-li
- YinpterochiropteraSuborder of bats
- YuccaPlant genus in the agave subfamily
- Yunxian ManYunxian Man (Chinese: 郧县人; pinyin: Yúnxiàn rén) is a set of three hominid skull fossils di