Some scientists theorize that high oxygen levels during the Paleozoic era allowed these dragonfly ancestors to grow to monster sizes. There are more than 3,000 known species of dragonflies ...

Some scientists theorize that high oxygen levels during the Paleozoic era allowed these dragonfly ancestors to grow to monster sizes. There are more than 3,000 known species of dragonflies ...

The emperor dragonfly is expanding north into Scotland and Ireland Dragonflies are moving northwards across Britain and Ireland as temperatures rise. More than 40% of species have increased their ...