The Enigmacursor has only been at the museum for a few months now. On the small size, it was probably about the size of a Yorkshire terrier dog. It’s a little away from the beat and track of the museum footfall, above the east exit on the stairwell. So if you are visiting have a look out for this new specimen

https://www.nhm.ac.uk/discover/dino-directory/enigmacursor.html