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Whale shark, an elasmobranch species
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Elasmobranchs species, including the whale shark, have a cartilaginous skeleton which weighs less than bone, so less energy is spent when moving. They have 4 to 7 pairs of gill slits, the whale shark has 5 pairs. Only four of them are active filter feeders: the whale shark, the megamouth shark, the basking shark, and the manta ray.
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