give features of polar bears, penguins, ox, yak, reindeer, other animals and birds living in polar regions.

Polar bears ,penguins and most of the animals living in the polar regions are adapted to their surrondings.For example ,a polar bear has a thick coat of fur to trap the body heat .It also has a layer of fat under its skin to get nutrition in winter months.Penguins have lost their ability to fly in the course of evolution so they have developed their wings into flippers to swim in the water.Ox, yak, reindeer and other animals have adaptations mostly similar similar to polar bears which I have mentioned above.