There are several collective nouns for cormorants. Take your pick of a flight, a gulp, a sunning, or a swim, of cormorants on a local pond.
This colony, squabble, flotilla, scavenging, 0r gullery, of sleeping Ring-billed Gulls has a guardian watching out for predators. In the winter of 2018 there was a Snowy Owl that had taken up residency in the area that preyed on gulls.
Robins are solitary birds except in the winter when they gather to feed. This blush, bobbin, breast, carol, gift, riot, reliant, rouge, ruby, or an around of robins gathered to feed on the seed heads of some sumac bushes in the CVNP.