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Heads
Artwork by colleenc
The picture illustrates a ferruginous hawk and shows several features common to most raptors.
The cere is the bare area surrounding the nostrils and can be different colours according to species, age and sex of the bird.
The gape is the edge of the mouth and is most obvious in very young birds.
The iris can also vary in colour according species, age and sex.
The forehead can vary in angle of slope, whilst the supra-orbital ridge is what gives some birds the threatening appearance.
Wings
Artwork by Arthur Bishop
Artwork by Tim Wooton
