Barn owlets share food with their younger siblings in exchange for grooming
Such cooperation is thought to be rare among the young of other birds
![barn owls](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2020/06/060420_PP_barn-owlets_feat.jpg?fit=1028%2C579&ssl=1)
In a barn owl nest, older siblings sometimes donate their meal to a younger, needier sibling, but only if the younger chick grooms the elder first, a study finds.
Chdwckvnstrsslhm/Flickr (CC BY-2.0)