One was stuffed with a silver cylindrical tube about fifteen centimeters long and the other contained two small, leathery avian eggs.

The mother will assist chirping, unhatched young to break out of the leathery eggs, by delicately breaking the eggs between her teeth.

They produce two leathery eggs.

Prior to hatching, the same glands would provide moisture to the leathery eggs, a situation still found in monotremes.

Finally it spat up a spotted, leathery egg the size of a small chicken.

Females are oviparous, with anywhere from 3 to 11 rather large, leathery eggs being laid (4-6 most common).

The female lays a single soft-shelled, leathery egg 22 days after mating, and deposits it directly into her pouch.

Once, when the skiff came close to the bank, he saw in a nest of mud the jagged shells of leathery eggs, freshly burst.

Rydell sat there, chewing his leathery eggs.

The pearl is a leathery egg where the harling continues to develop for one to two weeks, at which point it hatches.