Hi Tweets,

>From UKBirdnet an item of interest posted by James Cracknell.

M

>>From New Scientist 11 April 1998 No2129 Page 15
>Paper Ref: Dudley, Robert The Journal of Experimental Biology (vol 201,
>p1043)
>
>To be concise:
>
>New research has suggested that Birds, Bats and flying Dinosaurs were
>able to take to the skies, due to a surge in oxygen levels in the
>atmosphere. This happened during the mid Jurassic era, when O2 peaked
>at ~26%...through on to the Cretaceous and Tertiary. Apparently the
>reappearance of Giant Insects occured at this time too. The extra O2
>would have helped vertebrates muster the energy for flight, along with
>the air being denser, making flight easier.
>