There is not one kind of 'good sperm' -- it depends on other qualities in the male

(Uppsala University) In a study published in Behavioral Ecology researchers from Uppsala University show that the same type of sperm is not always the best for all male birds. Depending on how attractive or dominant you are you might be more successful with longer or shorter sperm.

Source: EurekAlert! - Biology - August 16, 2018 Category: Biology Source Type: news