This is a preview. Log in through your library . Abstract An important factor in the evolution of reproductive strategies in birds is the loss of a clutch or a brood. Many avian species produce a ...

Female starlings who have ingested dilute concentrations of antidepressants while feeding on worms, maggots and flies at sewage treatment plants appear to be less attractive to the opposite sex.

Witschi and Miller 1 have shown experimentally that the yellow bill colour of the starling in the breeding season is induced by male sex hormone. This yellow colour does not develop after the removal ...