They just get used to the noise and such, and especially with places like Cedar Point, it's literally a smorgasboard. All the food that people drop or deliberately feed the birds, and all the bugs from the lagoons, wow, they'll never have to worry about food.
I remember the rabbits that lived under the Raptor loop a few years back - it was the cutest, craziest thing: a cute little bunny just nibbling away every time an 8-ton train roared through the loop. I still wish I'd taken a picture!
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/