There aren't many mammals. Only cow and shrew comes to mind.
If you add birds, you can get a few more words in like swallow, sparrow, crow, macaw, and jackdaw.
There are words like squaw, widow, nephew, but they don't quite fit as a mammal's name.
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Walrus and whale are aquatic mammals. They begin with the letter W.
Walrus
Whales and walruses are two animals with names starting with the letter W.
Whales Wolves Wharf Rat Wallabies Wombat (Yes, marsupials are pouched mammals)
There aren't any countries that end in the letter w