Scientists from China have discovered what they believe to be the smallest known dinosaur.

The specimen, from Northern Myanmar, consists of a bird-like skull, smaller than a fingertip, trapped in 99 million year old amber. 

Researchers from the prestigious scientific journal, Nature, say that the dinosaur would have been similar to the size of a hummingbird seen today.

The discovery is expected to shed light on how small birds evolved from dinosaurs.