Why don't giant prehistoric insects still exist?

Three hundred million years ago, dragonfly-like creatures with wingspans stretching 70 centimeters patrolled the skies of a ...

Explanation for why we don’t see two-foot-long dragonflies anymore fails

The problem with diffusion is that it’s notoriously slow. The oxygen constraint hypothesis argued that the larger the insect ...
Earth.com

Earth's first insects were massive, some having wingspans over two feet long, and scientists aren't sure why

Scientists rethink why giant insects once ruled the skies, finding oxygen may not explain their size or disappearance.

Massive insect body size 300 million years ago may not have been due to high atmospheric oxygen

Three-hundred-million years ago, Earth was very different. The continents had coalesced into Pangea, which was dominated in ...
Briefly on MSN

South African scientists debunk ancient myth about why prehistoric insects grew so large

Researchers from the University of Pretoria debunk the myth that high oxygen levels were essential for ancient insects' 70cm ...

Study Challenges Popular Theory on Why Primordial Bugs Were So Darn Huge

Scientific consensus is that high oxygen levels allowed these humongous fliers to exist, but a new study throws that idea ...

Giant dragonflies once roamed Earth’s skies. New research upends the textbook theory of why they went extinct

Insects first took to the skies about 350 million years ago, some 200 million years before birds first flapped their wings. By the end of the Carboniferous period, 300 million years ago, some flying ...
Yahoo

Crane fly? Big mosquito? These giant bugs are everywhere in Oklahoma. Here's what they are

Add Yahoo as a preferred source to see more of our stories on Google. Whether you call them crane flies or "skeeter" hawks, the spindly-legged flying insect is an annoyance to humans and a plaything ...