I first spotted a black rabbit before the photography bug bit and just assumed it was an escaped pet. However I've been noticing them more and more recently and managed a few distant shots of one near work a couple of weeks ago.
And then I spotted one under the feeders in the car park and managed to get some better pictures. I've heard a few reasons why there are wild black rabbits which range from the escaped pet through defective genes to natures way of controlling the population. The black rabbit stands out more and so is an easier target for predators!
I'm not sure what the reason is but they are very distinctive and very welcome.