What is the difference between animals living in the arctic zone and taiga animals?

What is the difference between animals living in the arctic zone and taiga animals? What do you think are the reasons for these differences?

The presence and species composition of animals in these natural zones differs due to climatic conditions and the availability of food resources. The zone of arctic deserts is characterized by low temperatures and an almost complete absence of vegetation, which affects animals (polar bear, leming, arctic fox). The species composition is poor. There are large forests in the taiga, therefore the taiga ecosystem will be much richer. Brown bears, moose, lynx, fox, wolves, deer and other animals live here).