Birds don’t always look like they do in field guides.

There are variations within a bird species due to obvious reasons such as age, time of year or sex. Immature birds take time to achieve adult plumage. That could be a few months or, in the case of the bald eagle, four or five years. Male wood ducks, one of the most splendid birds in New England during breeding season, is a dull brown duck after shedding its breeding feathers. Sexually dimorphic birds, such as cardinals, have obvious differences between males and females.

Sometimes, even the sun can make birds look different. Grackles may appear purple, green, blue or black, depending on how the light hits it. Male indigo buntings can look spectacular or rather ordinary depending on the sun.

There are also regional differences among bird species. Blue jays in New England, I have found, are much brighter and larger than the blue jays in Florida. I’m also surprised when I see how small the blue jays are when I visit my brother in southern Florida.

Some bird species have different morphs. Most of the red-tailed hawks in New England are lighter overall than their western counterparts. This is also commonly referred to as a phase. The best example of a morph I can think of is not a bird at all, but the gray squirrel. Gray squirrels also come in white and black. In fact, in some parts of the country, black gray squirrels are the norm and gray ones are the rarity.