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- 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
- yellow-bellied seedeater 1
- yellow-bellied siskin 1
- yellow-billed cacique 1
- yellow-billed cuckoo 20
- yellow-billed magpie 4
- yellow-breasted chat 54