There is none. It is just the pigmentation of their feathers. A mother pigeon who has brown feathers is likely to lay an egg with a pigeon inside it of similar pigmentation, just as a black woman will probably give birth to a black child.
Yes. Taupe is between brown and gray.
Mahogany is reddish-brown and ebony is gray-black.
The only difference between gray and white PVC piping is in the color. They're both PVC.
From personal observation I'd conclude that squirrels or pigeons may be it. Some may believe it's the cockroach. Most Common Animals in New York City are: The Brown Rats Gray Squirrels The Rock Pigeons
its darker
one is light gray one is dark gray
yes brown is way better than gray
There are various color patterns depending on the type of pigeon. White, gray, brown, black, and a sort of burnt orange are common colors.
African elephants are gray and sometimes shades of brown.
Donkeys are usually gray or brown. Or somewhere in between.
yes it had colors
gray water is the waste water from washing.