The American tree sparrow often occurs in flocks of up to 50 birds. In habitat and behavior ... Winter: more buffy; rufous color on crown sometimes forms a central stripe. Juvenile: streaked ...

Birds are perhaps the most diversified creatures on Earth, with such impressive variety in colors, patterns ... found in western North America. Rufous Hummingbird (Selasphorus rufus) Small ...

Color morph distribution is more complex. In most areas intermediate brownish birds compose less than 10 percent of the population; but in Florida, gray, rufous, and brownish birds are evidently ...