Extreme sleep behaviour of Antarctic penguins

1. Penguins swim by using their ________.

2. Sleeping ______ hours a day helps penguin parents be away for many weeks

November is when Chinstrap penguins often lay their eggs in tiny rock _______.

1. Typically, one of the parent penguin goes ______ for meal while another stays to guard the eggs.

Penguin eggs and young penguins are eaten by skuas by _____ and other penguins.

Scientists observed how Chinstrap penguins slept by connecting a device to measure the _____ of the brain.

Chinstrap penguins benefit from _____ because they are important for their lives.

Frigatebirds can sleep by using only one half of their _______ at a time.