Refraction of Light in Water

The mountain biking crew made an epic trip this weekend. We left West Chester, PA on Saturday for my place in Rehoboth. 120 miles, 10-20 mph headwind, and 7 hours later we rolled right into the Dogfish Head Brewpub in Rehoboth. The Brewpub manager Jason was expecting us and bought us a round. Matt even got to speak with the Owner Sam Calagione of Brewmasters. We were the talk of the place for that night. Good times.

We took a day off to stink up my place and drink and laugh about the stupid shit cyclists laugh about. I would recount it, but it was really really stupid. Trust me. Then we rode back home. Well 90 miles of it for most of us. Except Big Show and Steve. Those beasts.

I am down in Rehoboth again. I have a lot of dead-time and a lot of pressure packed decision making. Right not is the dead-time phase. During dead-time I think about interesting things, like this:
What do fish catching birds "think" when they re-calculate for the refraction of light in water.

Do the just know to aim a certain amount lower depending on what angle they are flying in at? Or does the brain just learn where the fish actually is and make it look like that is where it is? Or do they have some primitive understanding of what refraction of light in water is?

I have a lot of time on my hands. Until tomorrow morning.