They are very difficult to identify in the wild: body form varies little from one species to another, and the observer must rely on often subtle differences in size, color, forehead shape and beak length.
The observer must rely on often subtle differences in size, color, forehead shape and beak length. They are very difficult to identify in the wild: body form varies little from one species to another.
They are very difficult to identify in the wild: body form varies little from one species to another. The observer must rely on often subtle differences in size, color, forehead shape and beak length.
They are very difficult to identify in the wild: body form varies little from one species to another. The observer must rely on often subtle differences in size, color, forehead shape and beak length.