Wednesday, March 10, 2021

Birds are Dinosaurs are Birds

 A fossil discovered in the Jiangxi Province near Ganzhou City (this fossil bank is a wealth of cool stuff) tells us that dinosaurs are more birdlike than we thought.

The incomplete skeleton of an adult oviraptoid was found crouching on a clutch of 24 eggs.

Specifically, she (or he, we have to assume that some dinosaurs traded off the duty or even left it entirely to males) was brooding.

This is the first evidence of a dinosaur brooding (as opposed to guarding) eggs.

The embryos in the eggs showed some difference in development, which indicates asynchronous hatching. Asynchronous hatching means that the mother starts brooding as soon as the first egg is laid, rather than waiting for them all to be on the ground. The eggs don't start to develop until the parent begins brooding. Eggs can be laid days apart in modern bird species that practice this.

It's seen in certain species of owl and raptor, and is a mechanism for ensuring that only the hatchlings that can be fed survive. This indicates a somewhat unpredictable diet. (Yes, it's kinda cruel, but in years where prey is hugely plentiful, it allows for a fast population increase).

Oh, and they also found evidence of a crop full of stones, something else modern birds do.

Dinosaurs are birds are dinosaurs.

(And those poor hatchlings would have been so cute).

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