References Martha (passenger pigeon)

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bibliography

burkhardt jr., richard w. (2005). patterns of behavior: konrad lorenz, niko tinbergen, , founding of ethology. chicago: university of chicago press. isbn 978-0226080901. 
rothschild, walter (1907). extinct birds (pdf). london: hutchinson & co. 
schorger, a. w. (1955). passenger pigeon: natural history , extinction. madison, wi: university of wisconsin press. isbn 1-930665-96-2. 






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