They're being sucked into some sort of machine.
2 seconds sound clip from the James and the Giant Peach (1996) movie soundboard.
You can hear this line at 00:31:58.066 in the Blu-ray version of the movie.
Quote context
[...]
- Shh! I hear teeth. Great, big, gnashing teeth.
- In the ocean? Scientifically impossible.
- They're being sucked into some sort of machine.
- It seems to have spotted us.
- What do we do? What do we do?
- The seagulls! It's our only chance!
- It would take the whole flock and then some.
[...]