'Wild at Heart' Applies to All Animals?

The new BBC series on the 'natural behaviour' of our companion animals or pets uses several interesting techniques and is quite graphic (http://www.bbc.co.uk/programmes/b050d3fx). The remarkable thing, however, is that, if you look carefully, you can see evidence of species-typical behaviour in all domesticated animals including those used in agriculture and laboratories. In deed, such behaviour often gives one a good idea on how to supply the best environments (ones in which they can express as much as possible of their normal behaviour-so long as it is not damaging in other respects-as can be achieved).