Devil's Flower Mantis -- Looks like an alien. One of the largest types of praying mantis, the Devil’s Flower Mantis is also one of the strangest. And that’s saying a lot when you’re talking about praying mantids. Females of the species can measure up to 5 inches (13 cm) long, and have developed a range of natural coloring that allows them to mimic the Devil’s Flower, a type of orchid.
Aliens on Earth: macro pictures of praying mantises and bugs by Igor Siwanowicz
The Treehopper "Helicopter" from the Steamy Jungles of your Mind Sure, Salvador Dali came up with some lovely surreal forms in his art, but this thing blows them all out of the water. Seen in Berlin's Museum of Natural History, this is the Brazilian Treehopper, or Bocydium globulare - a real living insect, which only pretends to be an alien helicopter: