Fused collarbones in birds, also known as a wishbone, are called:

Birds do this once or twice a year to shed feathers and replace them with new ones.

Birds are known to survive in virtually all known environments. To which class do they belong?

Feathers are modified _________ used for flight and conserving body heat.

This habit birds practice involves rubbing their feathers with oil using their beaks.

In mammals, oxygen and nutrients are transferred from the mother’s blood, through the _______, to the blood of the unborn animal.

Most mammal species are ____________, which means that the females carry young in uterus and give birth to live young.

Female mammals secrete milk from ___________ to feed newborns.

An example of a flightless, swimming bird is a

Which of the following is an example of a perching or songbird?

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