新托福阅读材料：NewGiantFlyingReptileFound;HuntedonFoot?(2)
"Amazing Productive" Green SaharaThese winged creatures' light and flimsy bones seldom survive as fossils, and examples from Africa are especially rare.
"All the pterosaur material that has ever been found in Africa could fit on a very small table," he said.
But Ibrahim and colleagues got lucky during their expedition: They found similarly aged fossil fragments that belonged two other previously unknown and unrelated pterosaurs.
These discoveries suggest that several different pterosaur species lived side by side, eating different prey in the ancient river delta.
For instance, one of the two yet-to-be described species had long, thin teeth that may have been used for grabbing fish while gliding over water.
Surrounded by dry land, this wet ecosystem also supported diverse forms of crocodiles and dinosaurs, Ibrahim noted.
"It was such an amazingly productive environment," he said.
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