This is bird note.

Raising baby birds is a lot of work.

You might think that after seeing off their fledged young ones, bird parents would call it a day, or a breeding season anyway.

And some birds do invest all their energy in one brood of chicks per year, especially bigger birds.

But a surprising number of species start again and raise another set of young in the same breeding season, what's called double brooding.

Young birds have high mortality rates, so doubling up on babies can help offset any losses that the species faces over the year.

And it turns out that even some bigger birds such as owls will raise another brood if conditions are right.

Some birds squeeze in even more broods each year,

particularly ones that often lose eggs to predators.

Morning doves, which nest on the ground, have been seen trying to raise six clutches of eggs

in one season.

These doves live by the saying that if at first you don't succeed. Nest, nest again.

For Bird Note, I'm Michael Stein.

Support for Bird Note is provided by Mary Pigget from Seattle

Washington and generous listeners around the world. You're going to be.