This is Bird No.

Sandhill cranes are famous for gathering in the tens of thousands during spring migration in Nebraska.

They roost overnight in shallow prairie rivers.

Then, in the early morning, they take off.

Within these massive gatherings of cranes are many smaller groups, tight knit family units.

A pair of adults might travel north with their young from the previous summer, along with grown-up offspring from several years ago.

In the summer, cranes find places to nest in wetlands and open areas throughout the northern US and Canada.

They'll raise up to three chicks over the season.

Sandhill crane families form a close bond.

They typically will stick together for the journey south and the winter, even in large flocks.

The parents will often stay together for the rest of their lives.

Cranes may even recognize family members from many years ago.

Researchers once observed that two 20-year-old brothers and their mates formed a family group for the fall and winter.

After decades, the family tie still held strong.

For Bird Note, I'm Ariana Rimmel.