It is to be remembered, however, that all these types interbreed freely, and that many intermediate, and forms of wholly doubtful position, occur.
It will interbreed with the blue hare.
Escaped farm salmon may interbreed with wild salmon and compete with them at their spawning grounds (5 ).
It was long believed that foxes and dogs would never interbreed; but several instances of such unions have been recorded, although they are undoubtedly rare.
Dingos, which are found both wild and tame, interbreed freely with European dogs introduced into the country, and it may be that the large amount of black on the back of many specimens may be the result of crossing of this nature.
