Odd head of seahorse cloaks its sneak attacks

Shape keeps turbulence from tipping off prey

12:01pm, November 26, 2013

PRETTY LITTLE SNEAKER  The head shape of a dwarf seahorse (Hippocampus zosterae) helps it sneak up on very jumpy prey. 

A dwarf seahorse can sneak unnoticed remarkably close to prey — less than a penny’s thickness away — thanks to the way the horsey head shape moves through water.

If they had just two or three milliseconds of warning, some of the seahorse’s prime prey, tiny crustaceans called copepods, would scoot away, says Brad Gemmell of the University of Texas at Austin. But a dwarf seahorse (Hippocampus zosterae) can strike even faster, within one millisecond. To succeed with its speedy strike, the seahorse somehow has to get within about a millimeter of its prey.

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