Jeholornis were relatively large, primitive birds, with a maximum adult length of up to 80 cm (2.6 ft).

Modern paleontology consistently has placed Archaeopteryx as the most primitive bird.

Enantiornithes is an extinct group of primitive birds.

It has a hand skeleton with a reduced third finger, like that of primitive birds and the oviraptorid Ingenia.

More than 200 fossils of a primitive bird, plus mammals, insects and plants, were also found.

The creature became renowned as the most primitive bird on the planet - until now.

Little primitive birds, beak full of teeth, about the size of a seagull.

Known for its fossils including primitive birds, the age of the ormation is uncertain.

Evidence suggests that some primitive birds lived at the same time as their dinosaur cousins.

The former is considered more likely, as an alula is not known from the most primitive Mesozoic birds.