Bird brain from the age of dinosaurs reveals roots of avian intelligence

Reading this, I had to wonder what was "opposite" about these "opposite birds". Apparently it's how the shoulder blade (scapula) connects to the coracoid bone (a bone not present in therian mammals). From Wikipedia's article on Enantiornithes:

> Specifically, in the Enantiornithes, the scapula is concave and dish-shaped at this joint, and the coracoid is convex. In modern birds, the coracoscapular joint has a concave coracoid and convex scapula.

Enantiornithes is a huge family. Kinda suprising why they didn’t survive the meteor but birds did

>Almost all [Enantiornithes] retained teeth and clawed fingers on each wing, but otherwise looked much like modern birds externally

I must say, I don't miss them.