(Phys.org) -- Giant insects ruled the prehistoric skies during periods when Earth's atmosphere was rich in oxygen. Then came the birds. After the evolution of birds about 150 million years ago, insects got ...

Biology - Evolution

Jun 04, 2012 4.7 / 5 (18) 2 |

(PhysOrg.com) -- A BBC expedition exploring inside the crater of an extinct volcano in Papua New Guinea (PNG) has discovered a lost world of dozens of weird new species and rare animals, including new frogs, ...

Biology - Plants & Animals

Sep 08, 2009 4.8 / 5 (64) 8