Antecedents, Referents, Reflexives...

So, in this sentence

the lizard bit down on the snake and prevented it from being eaten

what was not eaten?

Nope!

Here's the whole awkward paragraph, in meme form (a King Snake trying to eat an Alligator Lizard, taken in 2014 (source of photo).

So clearly, it's meant to be the lizard. But nope. Just nope.
"It" can't be the lizard, not syntactically.

Pronouns go to the nearest referent - and that's "snake". Also, since "lizard" is the subject of "prevented", any pronoun referring to it has to be reflexive. That is, "itself". Using the reflexive pronoun directs the reader back to the correct antecedent.

There are, of course, a few more infelicities ("it's all depended", for one), but they don't mislead the reader.