Flapjacks is the domestic bunny, adopted by Ryan.
He is one of the sons of Pancakes, adopted by Summer Roberts.
When Summer decided to free a bunch of animals from lab testing, she got kicked out of college. But she also got her adorable pet rabbit, Pancakes. During the series finale of The O.C., Summer, along with Taylor Townsend, discovers a group of rabbit kittens under her bed, and that's how she realizes that Pancakes is actually a female.