To our knowledge, there's no correlation between a man's singing ability and his care and attentiveness as a father.
But any Pavarotti among the nightingales will serenade his mate while she sits on her eggs.
And after they hatch he will visit the nest about 16 times each hour to feed their offspring.
Because, among nightingales at least, the best singers also make the best fathers.
So finds a study in the journal BMC Evolutionary Biology.
Some 80 percent of birds practice biparental care, meaning both the male and female rear their offspring together.
So it's crucial for a female bird to pick as a mate the most promising father—both genetically and behaviorally.
Female birds look for signs of fitness that range from the flamboyant plumage of the peacock to the bizarre dances of birds of paradise.
And for nightingales,it's the most elaborate song that apparently wins the day.
The average male has some 180 tunes in his repertoire.
These avian Sinatras vocalize highly variable song types including buzzes, whistles and trills.
And such virtuoso singing seems to signal the female that this is a guy she can count on.
That is, when it's time to help raise the kids, he's not a flight risk.
1.at least 无论如何，反正
例句:Try to eat at least four slices of bread a day.
2.look for 寻找；期待
例句:They look for foods that are low in calories.
3.crucial for 关键是
例句:Coming on as a substitute, he scored four crucial goals for Cameroon.
4.range from 从…变化到…
例句:The tactics employed can range from overt bullying to subtle emotional blackmail.