@article {600,
	title = {Hormonal correlates of siblicide in Nazca boobies: support for the challenge hypothesis},
	journal = {Hormones and Behavior},
	volume = {46},
	year = {2004},
	note = {Sulidae},
	pages = {665-662},
	keywords = {yesnest},
	author = {Ferree, E. D.M. C. Wikelski and Anderson, D. J.}
}
@article {812,
	title = {Territorial aggression and hormones during the non-breeding season in a tropical bird},
	journal = {Hormones and Behavior},
	volume = {45},
	year = {2004},
	note = {Thamnophilidae},
	pages = {40-49},
	keywords = {nesting seasonality, yesnest},
	author = {Hau, M. and S. T. Stoddard and K. K. Soma}
}
