Everything you need to understand or teach The Voyage of the Space Beagle by A. E. van Vogt.
As the novel begins, Coeurl is prowling his desolate planet looking for food. The arrival of beings in a spaceship, beings who can be his food, inspires ravenous hunger.
The beings are humans on a scientific expedition. They are curious about this vaguely cat-like alien and carefully bring the caged alien into their ship. On board, the alien proceeds to kill as many of the humans as it can, and to take over...
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A(lfred) E(lton) Van Vogt