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A hinge that extends its proboscis to feed on the bottom of the tankAllyson Evans A fish found only in West African rivers and forest pools, it can protrude a tree-like snout to suck up food or inhale air like a snorkel. The hinge (Phractolemus ansorgii) has what biologists call a deployable proboscis, a tubular structure folded over its head that can be extended up or down. The lips of the proboscis are lined with tooth-like structures made of keratin, which fish use to scrape off algae or other detritus. Allyson Evans at George Washington University in Washington DC and…