@article {Morton1975Ecological,
	title = {Ecological Sources of Selection on Avian Sounds},
	journal = {The American Naturalist},
	volume = {109},
	number = {965},
	year = {1975},
	month = {January},
	pages = {17{\textendash}null},
	publisher = {The University of Chicago Press},
	abstract = {doi: 10.1086/282971},
	keywords = {bioacoustics, birds, ecology, evolution},
	doi = {10.1086/282971},
	url = {http://dx.doi.org/10.1086/282971},
	author = {Morton, Eugene S.}
}
