- the long, skeletal finger of an aye-aye, used by this lemur to tap on trees to locate hollow tunnels where delicious insects hide
- the barrel-shaped eyes of a Pacific barreleye fish that turn upward to watch for prey above through its transparent head
- the big, bulbous nose of a proboscis monkey designed to attract mates
- the armor-like scales of a pangolin that are so tough that even lions and tigers can't bite through them
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