They believe humans are reincarnated in animal form.

他们相信人死后转生为动物。

《牛津词典》

At one time we could transfigure into any shape including any animal form.

在某个时候，我们能变身成任何外形，包括任何动物形体。

youdao

Without habits nothing recognizable as a human or even animal form of life would be possible.

如果没有习惯，就无法识别出作为人或者动物的生命形式。

youdao

The study used an animal form of H.I.V.

VOA: special.2009.03.16

Readers were quick to point out that weres can only turn into one type of animal, while shape-shifters can take any animal form.

WSJ: How to Kill a Vampire (Series)

Rather than studying the most complex form of memory in a very complicated animal, we had to take the most simple form -- an implicit form of memory -- in a very simple animal.

CNN: A Nobel Prize with help from sea slugs

Two flu pandemics (in 1957 and 1968) that caused large numbers of human deaths were caused by human and animal viruses mingling to form hybrids.

ECONOMIST: Averting a global plague | The