The animals mentioned in Episode 2 are aurochs, a wooly mammoth (or mastodon), a wooly rhinoceros, a cave bear, and dodos. As a result of the incident being 'filtered' through the powers of two death-related entities, a good deal of extinct animals are making their appearance. It is limited, however, to extinct animals which have lived at some point alongside homo sapiens. The only exception are a pod of plesiosaurs I haven't used yet and will use later.
Also, any alien animals will only be permitted if they are Alternate-Mars animals.
Also, any alien animals will only be permitted if they are Alternate-Mars animals.