It is an arboreal, but heavily built species with a brown or tawny coloration.

A large number of mammals and predatory birds have a brown coloration.

O. viridulus tend to be green all over, but some may have brown coloration on the sides.

The forewings are white, but mostly with a dark brown coloration.

The narrow aperture is white with a brown coloration at the anterior end.

The result is brown coloration of the needles and leaf drop.

They have a stocky body with a black or dark brown basic coloration, including head and legs.

The underwing is largely white with some black spots and brown coloration.

The brown coloration extends along most of the back of the abdomen in the male.

The bark of the adult tree varies from medium grey to a red brown coloration.