The desert mule deer is a common sight in west Texas, but wildlife biologists in the area came across an extremely uncommon ...

The 20p piece is a rare “mule” coin dating from 2008, and fetched £90 at auction. The coin was minted without a date due to an error and quickly became a sought-after collector’s items.

“It’s difficult for biologists to quantify the number of mule deer that have this condition, but it’s estimated to be around 1 in several million – making it even more rare than an albino ...