No crocodiles, Thank God!

A tourist traveling on his holiday vacation decides to stop for a swim in the Amazon river.

Being afraid of crocodiles, he sees a local and asks,
“Are there any crocodiles in this water?”
“No mister, not even one” the answer came.
Being happy to hear this, the tourist enters the water and starts to swim.

He was having such a great time when at one moment he sees a dark spot in the water several feet away from where he was swimming. Seeing that the local was still near the water, he asks again,
“Are you sure there are no crocodiles in this water?”
“I am pretty sure, mister. They are all afraid of sharks.”