Does anyone know of a good fitness function for evaluating an animal characteristic in genetic algorithms? I'm doing a project. The prompt is: Select some features of an actual organism and design a genetic algorithm together with a reasonable fitness landscape to evolve the organism in time. I'm using the Matlab genetic algorithms toolbox, but can't think of a good organism characteristic that has an interesting fitness function. I can do anything, like bird beak length, elephant ear radius, etc... I just need a good way to evaluate how the possible genotypes will survive - thus, I need a good fitness function! Maybe from literature?