Yes last time I flew out to Zante we got an earlier slot but had to bin it because we would have got there too early for the turtles. Plane was not that full and we were ready to go but had to announce due to turtle activity (i.e.humping) everyone would sit tight for a while.
There is a barman out there who makes much mileage of showing you a postcard of two turtles at it and all he can say in english is "you tomorrow hey hey yes yes carretta carretta (being the greek word for turtle)....."