他们曾观察过这些动物的习性。
They had observed regularities in the behaviour of the animals.
但是，不了解动物的习性与需求，也可能导致一些错误的做法。
But a lack of knowledge about animals' habits and needs may lead to some wrongs.
退一步说，动物的习性确实能很神秘，因而某些动物会成为猜想的焦点也就不足为奇了。
Their behavior can certainly be mysterious to say the least1), so it's no wonder that some of these creatures have become the focal2) point of speculation.
应用推荐