LOESCHE, P, BEECHER, MD, STODDARD, PK. (1992). PERCEPTION OF CLIFF SWALLOW CALLS BY BIRDS (HIRUNDO-PYRRHONOTA AND STURNUS-VULGARIS) AND HUMANS (HOMO-SAPIENS)
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JOURNAL OF COMPARATIVE PSYCHOLOGY, 106(3), 239-247. 10.1037/0735-7036.106.3.239
LOESCHE, P, BEECHER, MD, STODDARD, PK. (1992). PERCEPTION OF CLIFF SWALLOW CALLS BY BIRDS (HIRUNDO-PYRRHONOTA AND STURNUS-VULGARIS) AND HUMANS (HOMO-SAPIENS)
. JOURNAL OF COMPARATIVE PSYCHOLOGY, 106(3), 239-247. 10.1037/0735-7036.106.3.239