Birds have a beak to manipulate their food but a new fossil discovery found that some birds evolved teeth adapted for specialised diets.
A study of the teeth of a new species of early bird, Sulcavis geeorum, suggested this bird had a durophagous diet, meaning the bird’s teeth were capable of eating prey with hard exoskeletons like insects or crabs.
The researchers believe the teeth of the new specimen greatly increase the known diversity of tooth shape in early birds, and hints at previously unrecognised ecological diversity, the Journal of Vertebrate Paleontology reported.
Sulcavis geeorum is an enantiornithine bird from the Early Cretaceous (121-125 million years ago) of Liaoning Province, China.
Enantiornithine birds are an early group of birds, and the most numerous birds from the Mesozoic (the time of the dinosaurs).
Sulcavis is the first discovery of a bird with ornamented tooth enamel. The dinosaurs from which birds evolved are mostly characterised by carnivorous teeth with special features for eating meat.
Sulcavis geeorum. Image credit: Stephanie Abramowicz
The enantiornithines are unique among birds in showing minimal tooth reduction and a diversity of dental patterns. This new enantiornithine has robust teeth with grooves on the inside surface, which likely strengthened the teeth against harder food items.
No previous bird species have preserved ridges, striations, serrated edges, or any other form of dental ornamentation.
“While other birds were losing their teeth, enantiornithines were evolving new morphologies and dental specialisations. We still don’t understand why enantiornithines were so successful in the Cretaceous but then died out maybe differences in diet played a part,” Jingmai O’Connor, lead author of the new study, said in a statement.
“This study highlights again how uneven the diversity of birds was during the Cretaceous. There are many more enantiornithines than any other group of early birds, each one with its own anatomical specialisation,” said study co-author Luis Chiappe, from Natural History Museum of Los Angeles County.