The correct option is D Frog
An ectotherm is a cold blooded animal that is unable to maintain its temperature. The temperature is influenced by the temperature of the environment. They are also called poikilotherms. Amphibians, like frogs, and reptiles, like lizards, are cold blooded while mammals and birds are warm blooded. Penguins and owls are aves (birds) and lemur is a mammal.