But if two male zebra finches both have an equally good song that they've practised their little hearts out to learn, how does the female decide who's the fittest? Todd Roberts ...

According to a study published in the journal Biology Letters on June 20, female zebrafish can select the best quality sperm using their female reproduction fluid (FRF)—the fluid that surrounds ...

Zebra finches are small Australian songbirds that often partner for life. Males sing melodies to attract a mate, while females learn which tunes they prefer by listening to adults.

Zebra finches are small Australian songbirds that often partner for life. Males sing melodies to attract a mate, while females learn which tunes they prefer by listening to adults.

"The female zebra finches in the playback experiment could directly hear the difference and 75 percent preferred the songs from the well exercised male," says Katharina Riebel, author on the study ...