One weird little fishy.: The mangrove killifish, Rivulus marmoratus. Photo USGS.

Researchers have found that the mangrove killifish, a two-inch-long fish common to Caribbean coasts, spends several months out of water, living in the hollows of trees. Most of the year, the fish live in muddy pools and are fiercely territorial. But during the dry season, they crawl into burrows carved into the trees by insects, pack themselves together tightly, and alters their metabolism to breathe air.

Oh, yeah, and the mangrove killlifish also has both male and female organs, so it can reproduce without a mate. This is one strange fish.

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