They will form large flocks on open water in winter.
If you have a large flock of them, it can be overwhelming.
During the winter, it groups together in large flocks at night.
They are often seen far from land, swimming in large flocks.
This happened again with a larger flock, and Jeff decided to go to the other blind.
It forms pairs or small groups, but does not form large flocks.
"It flies in large flocks on every side of us."
On this morning several large flocks passed overhead but failed to come in.
It is also home to a large flock of migratory birds.
It is also common for large flocks to send one or two birds ahead of them when they are flying to a new area.