Seabirds use preening to decide how to divvy up parenting duties
Grooming issues can signal health, other problems
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)