Seabirds use preening to decide how to divvy up parenting duties
Grooming issues can signal health, other problems
![Common murres](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/05/050417_EE_common-murre_main.jpg?fit=860%2C460&ssl=1)
FAMILY AFFAIR Common murres take turns brooding their chick and foraging for fish. Preening each other acts as a health check and way to negotiate parental duties if one bird is in poorer condition, new research suggests.
DickDaniels/Wikimedia Commons (CC BY-SA 3.0)