Dragonflies, from the order Odonata, have been around for over 250 million years. The most conspicuous difference in their evolution over time is the steady shrinking of their wingspan from well over two and a half feet down to a few inches. Voracious predators, today they dine on bees, wasps, butterflies and avoid the attentions of birds and wee lizards -- but back in the day, they had a much larger selection of meals within their grasp. Small lizards and birds who today choose dragonflies as a tasty snack used to be their preferred prey.
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- Small Topics on Neutrino’s for Discussion
- Systems Biology Post-Docs May Have A New Best Friend In...Philip Morris?
- The Art Of Cognitive Rehabilitation Therapy
- Top Asymmetry: The Latest From DZERO
- Iron Deficiency Does Not Cause People To Become Vegans
- Oh, What A Tangled Web The NSA Weaves
- New Theory On Cause Of Endometriosis
- "A 2-km setback is very rare. One-fourth of that and less, if any, is much more common. Hence the..."
- "You seem to be arguing about obvious points - none of which I made. Of course sleep issues lead..."
- "Your attempt to undercut claims of ill health as being made especially among people who were against..."
- "Here's an example of a webcam geiger counter: http://www.cg.tuwien.ac.at/research/publications/2012/Auzinger_2012_GeigerCa..."
- "Everything else is finally just details -- important details, but variants on this theme. index..."
- Education 'protects' poor women from fattening effects of rising wealth
- Deer proliferation disrupts a forest's natural growth
- New guidelines employ a team approach to autism diagnosis and care
- Research on 3D scaffolds sets new bar in lung regeneration
- New NASA Van Allen Probes observations helping to improve space weather models