Zoologger: The fish with a chemical invisibility cloak

New Scientist -Pirate perch are night-hunting predators that will eat almost anything, from insects to fish. They earned their name after people tried keeping them in aquariums: like a merciless pirate, the perch would kill and eat all the other fish. 'They are pretty voracious,' says William Resetarits of Texas Tech University in Lubbock.

Habitat: Clear, warm waters in the central and eastern US, particularly in Mississippi . A squirrel tree frog lurks by a small pond, seeking a safe place to lay its fertilised eggs.

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Pirate perch are night-hunting predators that will eat almost anything, from insects to fish. They earned their name after people tried keeping them in aquariums: like a merciless pirate, the perch would kill and eat all the other fish. "They are pretty voracious," says William Resetarits of Texas Tech University in Lubbock.