Crows are extremely social animals. Same goes for many other animals such as most fish, wolves, caribou, lemmings, and (to a certain extent) humans. They see value in large groups for two main reasons:
1. There are many more eyes to watch for predators, and
2. There are many more eyes when searching for food.
When a member of the group spots a safe food source (like your neighborhood?) you might see several hundred Crows. This behavior is common to lots of birds. Grackles, Starlings and sparrows come to mind.
Conversely, there are anti-social animals that see value in going it alone, or hunting in very small (often related) groups.
We've all known for years that playing outdoors benefits children. Now it's been shown to be true. Outdoor play improves kids' bodies, lets them think more realistically, improves sleep, reduces obesity, increases attention and enhances learning abilities.
The National Wildlife Federation has just completed a pilot project on childrens' play in backyards, as well as in public sites like parks, playgrounds and preserves. You can read more about it at www.NWF.org/playspaces
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