@article {47311,
	title = {Ecological Sources of Selection on Avian Sounds},
	journal = {The American Naturalist},
	volume = {109},
	year = {1975},
	month = {Jan-01-1975},
	pages = {17 - 34},
	issn = {0003-0147},
	doi = {10.1086/282971},
	url = {http://www.journals.uchicago.edu/doi/10.1086/282971},
	author = {Morton, Eugene S.}
}
