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1. Crustacean-trapping teeth in mesosaurs and crabeater seals
   The multi-lobed post-canines of Lobodon carcinophagus are a functional analogue to the long, thin cage-like teeth of Mesosaurus, as both cage and prevent the escape of small crustacean prey.

2. Lateral line system in fish and other animals
   Some cavefish are completely blind, so how do they manage to navigate through their environment with astonishing ease?

3. Suction feeding in fish, amphibians, reptiles and aquatic mammals
   Probably everyone is familiar with the walrus, but did you know that it generates a vacuum in its mouth to suck clams out of their shells? And this is just one example of suction feeding, the feeding mode typically used by bony fish…

4. Teeth in aquatic reptiles
   Aquatic reptiles tend to display one of three dentition types, well adapted to either seize and slice large vertebrate prey, pierce and gouge slippery fish, or entrap small prey such as crustaceans.

5. Baculum (penile bone) in mammals
   Ouch!! Gentlemen, fancy a bone in your penis? Seems a bit risky, given it could fracture during copulation. Even our near ancestors had such a bone. It has probably evolved several times, but what is its function?