Quirks & Quarks

May 8: Sounds of a predator, horses are well-diggers, grass defuses a toxic explosive and more…

Plastic from fish waste, animals mate with relatives, mastodon poop and pupillary variety.

Plastic from fish waste, animals mate with relatives, mastodon poop and pupillary variety.

Different shaped pupils help animals see as they need to. (Shutterstock / Mircea Costina)

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