(Sort boys from girls by that)
(They are not all squished flat):
Pterosaurs from China
With wingspans twice your height.
Like eagles they ate fishes,
Flew on bones so thin and light.
Lived in flocks gregarious
At their lakeshore home.
They lived together and they died
Together in a storm.
A hundred million years ago
They left a thousand bones,
Left narrow skulls with bony crests,
Left eggs that turned to stones.
Thanks to philly.com and Wang et al., Sexually Dimorphic Tridimensionally Preserved Pterosaurs and Their Eggs from China, Current Biology (2014), http://dx.doi.org/10.1016/j.cub.2014.04.054 (open access in July)