Dragonflies
10 Fun Facts About Dragonflies
1 ) Dragonflies were some of the first winged insects to evolve, some 300 million years ago. Modern dragonflies have wingspans of only two to five inches, but fossil dragonflies have been found with wingspans of up to two feet.
2 ) Some scientists theorize that high oxygen levels during the Paleozoic era allowed dragonflies to grow to monster size.
3 ) There are more than 5,000 known species of dragonflies, all of which (along with damselflies) belong to the order Odonata, which means “toothed one” in Greek and refers to the dragonfly’s serrated teeth.
4 ) In their larval stage, which can last up to two years, dragonflies are aquatic and eat just about anything—tadpoles, mosquitoes, fish, other insect larvae and even each other.
5 ) At the end of its larval stage, the dragonfly crawls out of the water, then its exoskeleton cracks open and releases the insect’s abdomen, which had been packed in like a telescope. Its four wings come out, and they dry and harden over the next several hours to days.
6 ) Dragonflies are expert fliers. They can fly straight up and down, hover like a helicopter and even mate mid-air. If they can’t fly, they’ll starve because they only eat prey they catch while flying.
7 ) Dragonflies catch their insect prey by grabbing it with their feet. They’re so efficient in their hunting that, in one Harvard University study, the dragonflies caught 90 to 95 percent of the prey released into their enclosure.
8 ) The flight of the dragonfly is so special that it has inspired engineers who dream of making robots that fly like dragonflies.
9 ) Some adult dragonflies live for only a few weeks while others live up to a year.
10 ) Nearly all of the dragonfly’s head is eye, so they have incredible vision that encompasses almost every angle except right behind them.
11 ) Dragonflies, which eat insects as adul
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The Chinese water dragon
The Chinese water dragon (Physignathus cocincinus) is a species of agamid lizard native to China and mainland Southeast Asia. It is also known as the Asian water dragon, Thai water dragon, and green water dragon. The genus name is Greek for "inflated jaw".
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