The following one refers to movie version (and actually was concerned with crocodiles, to be honest
)
So:
Gandalf on Caradhras raises his hands and starts murmuring
Aragorn: What is all about, Gandalf?
Gandalf: I'm scaring Crebain away!
Aragorn: But there are no Crebain this high!
Gandalf: Exactly, As I'm
very good at scaring them away!