Male fifteen-spined sticklebacks that shake their body frequently when courting also provide more nest fanning of their eggs, and are preferred by females. This is an example of

Male satin bowerbirds that build well-constructed bowers also perform better on cognitive tests, and have higher mating success. This is an example of

Female widowbirds that prefer to mate with long-tailed males produce long-tailed sons and daughters that also prefer males with long tails. This is an example of