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- Janetaescincus braueri — Brauer's Burrowing Skink
- Janetaescincus veseyfitzgeraldi — Vesey-Fitzgerald's Burrowing Skink
- Jardinella acuminata
- Jardinella colmani
- Jardinella jesswiseae
- Jardinella pallida
- Joiceya praeclarus
- Junco insularis — Guadalupe Junco
Read more about this topic: IUCN Red List Endangered Animal Species