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Yacare Caiman gaping

Yacare Caiman hoverflies Paraguay River, Taiama Reserve, Pantanal, Brazil. Regulate its body temperature (thermoregulation).

Yacare Caiman (Caiman yacare) with attendant hoverflies at the edge of the Paraguay River, Taiama Reserve, western Pantanal, Brazil. Gaping to regulate its body temperature (thermoregulation).