Red Squirrel, ​Sciurus vulgaris

The red squirrel or Eurasian red squirrel is a species of tree squirrel in the genus Sciurus. The red squirrel is an arboreal, omnivorous rodent. In the UK numbers have been dwindling.

Where do they live: From the UK across Northern Europe and Siberia.
What do they eat: They eat berries and nuts.
Whats their habitat: Coniferous forest
How many left in the wild: 140,000 in the UK
Conservation status: Least Concern (Population decreasing)
Major threats: The grey squirrel and deforestation 

YouTube

In the UK there are only small pockets of Red Squirrels left in the wild mostly in the Scottish Highlands.

Wikipedia

The decline is associated with the introduction by humans of the eastern grey squirrel  from North America

Conservation Project

The Zoological Society of Wales does not have the financial resources to employ research scientists.