Beetle bonanza

29 Mar 2023

Have you stopped to admire a beetle lately? How about thousands?!

Spotted recently on Kronos Hill, an amazing swarm of Soldier Beetles were founding mingling on the trunk of a eucalypt.

Swarm of dark coloured beetles on pale truck of eucalypt tree.

The ‘Plague’ Soldier Beetle

Although seen in smaller numbers during spring and autumn, this native species is known to form huge swarms in late summer, particularly after a few good years of rain. Also known as the ‘Plague’ Soldier Beetle, this sight may be alarming, but they are harmless and not devouring the plant they are on – their minds are on a different activity entirely!

Close-up of swarm of Soldier Beetles on tree trunk. Each beetle is dark brown coloured with orange-coloured band on the thorax.

About Soldier Beetles

These beetles have gathered together to mate and once done, disperse to lay their eggs. The beetle larvae live in the soil and feed on soft-bodied invertebrates. Once mature, the flying adult has a life span of 2-3 months and feeds on nectar and pollen as well as insects.

The Soldier Beetle has a yellow-orange abdomen that is mostly covered by its dark green wings and usually reaches 15mm in length. Although they don’t have a stinger, when handled, this beetle excretes a distasteful fluid from their glands that helps to repel predators.

Like other insects, Soldier Beetles are an important part of the Park’s ecosystem. They keep a check on the insect population they prey on as larvae and provide a pollination service for flowers as adults.

Close-up of single Soldier Beetle. It has a green wing-case, and orange-coloured band on its thorax.