Some species build their nests in trees - great globular masses sometimes three feet in diameter, supported on the larger branches, and connected with the ground by covered passages on the outside of the tree.
Witches-brooms are the tufted bunches of twigs found on silver firs, birches and other trees, and often present resemblances to birds nests or clumps of mistletoe if only seen from a distance.
These driver ants shelter in temporary nests made in FIG.
The tracks along which the ants carry the leaves to their nests are often in part subterranean.
It constructs large ball-like nests of dried leaves, lodged in a fork of the branches of a large tree, and with the opening on one side.