I came across this fuzzy little Eastern gray squirrel (Sciurus carolinensis) walking through St James's Park in London. Hard to think of it as an invasive species that is displacing the native Eurasian red squirrel (Sciurus vulgaris) in Britain. But a lot of people, including the government there is thinking of ways of eradicating these guys such as re-establishing populations of the indigenous pine martens that would keep the grays in check but allow the reds to survive since those are better adapted to escape the pine martens. You can read more about it HERE.
I took these images with my old Nikon D40 and a Nikkor 18-55mm f/3.5-5.6G ED II lens.
Seems like this gray has a really high tolerance for humans...