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- Yacimientos de Verterbados 1
- Yacimientos fosilíferos 2
- yak 2
- Yap1 1
- Yaquina Bay 1
- Yardstick Competition 2
- yardstick competition 2
- Yasuni National Park 1
- years of schooling 1
- Yeast 1
- Yeast antigens 1
- Yeast attachment 1
- Yeasts 1
- Yeats 1
- yellow (mangrove) warbler 12
- yellow rail 2
- yellow warbler 94
- yellow-bellied elaenia 5
- yellow-bellied flycatcher 3
- yellow-bellied sapsucker 5