Scribbly-gum bark with two kinds of scribble

The 'scribbles' on the bark of these trees are made by the larvae of tiny moths, which burrow under the bark. Like many eucalypts, scribbly gums lose their old bark each year, and when they do so the trails of the larvae can be seen.

The higher, brown scribble is typical of the scribbly-gum tree, while the lower, reddish scribble is more commonly found on the Sydney red gum.

Maddens Plains, New South Wales, Australia