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- Xanthidae 3
- Xantho incisus 1
- Xanthorhoe rupicola 1
- Xenochlorodes nubigena 2
- Xenomerus ergenna 1
- Xestia c-nigrum 4
- Xylocopa 1
- Yellow Warbler 1
- Yellow-crowned Night Heron 1
- Young birds 1
- Young volcanic 1
- Yponomeutidae 1
- Zapata 1
- Ziphius cavirostris 1
- Zoea 2
- Zonaria tournefortii 1
- Zonation 6
- Zonitidae 3
- Zoogeography 14
- Zoogonidae 1