Eurycnema goliath, the Goliath stick insect, is the second largest stick insect (after the Titan stick insect) in Australia, and though not as long, the insect has a heavier, sturdier build. The first instar of a nymph is small, brown, and ant-like, without wings, however the adult insects are green and yellow, though colors can slightly vary, are very large, and have wings.