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CASA analysis of sperm of two bird species, Zebra finch (Passerine, Neognathae) and ostrich (Paleognathae). In Zebra finch, great similarity can be observed in the form of sperm tracks, contrasting the large variation found in ostriches which show less forward-progressing sperm. Sperm 1 is representative of a rapid progressive sperm from Zebra finch and 2, 3 and 4 three are different swimming patterns of ostrich sperm, with 4 showing typical features of a hyperactivated sperm.
