Officially "The rarest insect in the world": The Lord Howe Island stick insect (Dryococelus australis) (25 Pics)

Dryococelus australis, commonly known as the Lord Howe Island stick insect or tree lobster, is a species of stick insect which lives on the Lord Howe Island Group. It was thought to be extinct by 1930, only to be rediscovered in 2001 (this phenomenon is known as the Lazarus effect). It is extinct in its largest habitat, Lord Howe Island, and has been called "the rarest insect in the world", as the rediscovered population consisted of 24 individuals living on the small islet of Ball's Pyramid.

The stick insects were once very common on Lord Howe Island, where they were used as bait in fishing. They became extinct there soon after black rats were introduced to the island in 1918 when the supply ship S.S. Makambo ran aground. The last one was seen on the island in 1920, and after that the species was thought to be extinct. In 1964, a team of climbers visiting Ball's Pyramid, a rocky sea stack 23 kilometres (14 mi) south-east of Lord Howe Island, discovered a dead Lord Howe Island stick insect. During subsequent years, a few more dead insects were discovered, but expeditions to find live specimens were unsuccessful.

In 2001, two Australian scientists, David Priddel and Nicholas Carlile hypothesized that there was sufficient vegetation on the islet to support a population of the insects, and with two assistants traveled to the island to investigate further. They scaled 500 feet of rock, but only found crickets. On their descent, the team discovered large insect droppings under a single Melaleuca shrub growing in a crevice approximately 100m (330 ft) above the shoreline. They deduced that they would need to return after dark, when the insects are active, to have the best chance of finding living specimens. Carlile returned with local ranger Dean Hiscox and, with a camera and flashlights, scaled the heights again. They discovered a small population of 24 insects living amongst a substantial build up of plant debris beneath the Melaleuca shrub.

Source: http://en.wikipedia.org/wiki/Dryococelus_australis

The largest insect on Earth: The Goliath beetle (Goliathus regius) (10 Pics)

The Goliath beetles (named after the biblical giant Goliath) are among the largest insects on Earth, if measured in terms of size, bulk and weight. Little appears to be known of the larval cycle in the wild, but in captivity, Goliathus beetles have been successfully reared from egg to adult using protein-rich foods such as commercial cat and dog food. Goliath beetles measure from 60–110 millimetres (2.4–4.3 in) for males and 50–80 millimetres (2.0–3.1 in) for females, as adults, and can reach weights of up to 80–100 grams (2.8–3.5 oz) in the larval stage, though the adults are only about half this weight.

Apart from their massive size, Goliathus beetles are strikingly patterned as well. Prominent markings common to all of the Goliathus species are the sharply contrasting black vertical stripes on the pronotum (thoracic shield).

Source: http://en.wikipedia.org/wiki/Goliathus

The most Powerful Insect Ever: The Rhinoceros Beetle. (10 Pics)

Rhinoceros Beetles are among the largest of beetles in the world. The Rhinoceros Beetle is aptly named because it has horns on its head, very much like the rhinoceros does.

Rhino Beetles reach 60 millimetres in length. They have two horns, one on the top of the head and the other projecting forward from the middle of the thorax. Each horn is slightly forked at the end. The two horns almost meet and by moving its head the beetle can pinch weakly with them.

From: http://www.animalcorner.co.uk/insects/beetles/beetle_rhino.html