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How Snakes Find Prey Underwater: Sea Snakes Use Visual and Chemical Cues for Foraging.

Zoological Science 2018 December
Fully aquatic adaptation generally leads amniotes to change sensory modalities drastically. Terrestrial snakes rely heavily on chemical cues to locate and recognize prey, but little is known about how sea snakes find prey fishes underwater. Sea snakes of the genus Hydrophis are fish-eating marine elapids which adapted from land to water approximately 5-10 million years ago. Here, using two species of captive Hydrophis snakes, we show that they can recognize and discriminate their preferred fish species solely by using olfactory cues. However, they locate places where their preferred fishes may hide without relying on chemical cues. These findings indicate that Hydrophis snakes find prey in water as follows: they use visual cues to locate a place where their prey fishes are likely to hide, and then use chemical cues to find and attack prey. As is the case for other aquatic amniotes, snakes also modified their sensory modalities upon becoming aquatic.

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