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Description
Rhinoptera bonasus is a familiar site in aquarium touch tanks. Many people mistake the flaps on the underside of its head for the mouth, but they're actually highly-modified extensions of the wing-like pectoral fins. The rays use these extensions to probe the sandy seafloor for the clams and other bottom-dwelling invertebrates upon which they feed.

Description
Rhinoptera bonasus is a familiar site in aquarium touch tanks. Many people mistake the flaps on the underside of its head for the mouth, but they're actually highly-modified extensions of the wing-like pectoral fins. The rays use these extensions to probe the sandy seafloor for the clams and other bottom-dwelling invertebrates upon which they feed.