[Immerito]

“The egg indicates this ancient flying reptile was a female, and that realisation has allowed researchers to sex these creatures for the first time. “

Translation: It allowed the researchers to pronounce another assumption.

The male of some species of birds (such as penguins) also sit on their eggs while their mate is away looking for food. What scientific evidence do they have that this bird is not male?

[goodusername]

“The male of some species of birds (such as penguins) also sit on their eggs while their mate is away looking for food.”

—In this case, however, it doesn’t appear that the egg had even been laid yet.

[Salamander]

“What scientific evidence do they have that this bird is not male?”

Somebody flipped it over and peeked?

:)