@tsarstepan,
Me too. I guess a lot of people don't like crows, but I do.
Here's an interesting pic from another source -
oops, there was another photo there yesterday of a wild mouse on a wheel, but this one is sweet too -
Could this dormouse also enjoy a little wheel running? Photograph: Andrea Zampatti/HotSpot Media
The article is about this -
According to a newly published study, wild mice frequently and voluntarily run on an exercise wheel if provided access to them in nature, even in the absence of a food reward. Further, the length of running bouts by wild mice matched those of captive mice. These findings dispel the idea that wheel running is a product of captivity, indicative either of neurosis or a mindless repetitive behaviour that may be associated with poor welfare or close confinement.
more -
http://www.theguardian.com/science/grrlscientist/2014/may/21/wild-mice-exercise-wheels-behaviour-stereotypy-neurosis