EVERYDAY SCIENCE

Detailed explanation-1: -For some birds, such as ostriches, cassowaries, kiwi, geese, and some species of swans and ducks, the males do not use the cloaca for reproduction, but have a phallus.

Detailed explanation-2: -It is present in amphibians, reptiles, birds, elasmobranch fishes (such as sharks), and monotremes. A cloaca is not present in placental mammals or in most bony fishes.

Detailed explanation-3: -A wide variety of animals have a cloaca. This includes amphibians, birds, reptiles, sharks, and monotremes like the platypus and the echidna. Sharks are classified as a separate type of fish called elasmobranch fishes. Monotremes are only found in Australia and New Zealand.

Detailed explanation-4: -Since birds have cloaca, birds “cloacal kiss” to transfer sperm to the female. 90-95% of birds are socially monogamous, meaning they have only one partner (although the key word is social rather than sexual). Most birds incubate their eggs –a form a parental care. Keep sex organs small during most of the year.