Osprey parents share a problem with a number of other species: How do you persuade maturing offspring to leave the nest? Being fed and looked after at home is comfortable, and consequently many offspring never want the coddling to end. But, it must.
The ospreys’s solution to this problem was treated extensively in a 2013 posting: It’s time you went. Essentially, the parents starve them out. An adult will taunt the chicks by flying past the nest with a fish, but will not deliver it. When it does deliver something to the nest, it is a stick, not a fish.
The message is: You want to continue to eat; get out there and fend for yourself.
This morning, I witnessed the delivery of an early eviction notice: the stick brought to the nest prompted a fervent bitching by the hungry chicks complaining about their unjust treatment.
Mommy delivers, not a fish but, a stick to her increasingly distraught chicks.
What we have here is a clear case of two bitching chicks.