I found this passage from a test.

The typical way in which the piranha attacks is by swimming directly into a shoal of fish. The attacked shoal scatters in all directions, and the piranha quickly overpowers individual fish. Small fish are swallowed whole. Larger prey have chunks ripped out of them, which the piranha swallows instantly so it can immediately take another bite.

I wonder why “prey” can be used with “have” since “prey” is uncountable noun.

And the answer key tells that “them” refer to “larger prey”. Why don’t we use “it” to refer to “large prey”?

I ’m not sure if all of this passage is correct. And for that sentence I think it should be “Larger prey has chunks ripped out of it.” Could you explain it to me?

I found this passage from a test.

The typical way in which the piranha attacks is by swimming directly into a shoal of fish. The attacked shoal scatters in all directions, and the piranha quickly overpowers individual fish. Small fish are swallowed whole. Larger prey have chunks ripped out of them, which the piranha swallows instantly so it can immediately take another bite.

I wonder why “prey” can be used with “have” since “prey” is uncountable noun.

And the answer key tells that “them” refer to “larger prey”. Why don’t we use “it” to refer to “large prey”?

I’m not sure if all of this passage is correct. And for that sentence I think it should be “Larger prey has chunks ripped out of it.” Could you explain it to me?