in·ter·breed 
(ĭn′tər-brēd)
(ĭn′tər-brēd)v. in·ter·bred (-brĕd), in·ter·breed·ing, in·ter·breeds
v.intr.
1. To breed with individuals of another species, subspecies, or variety; crossbreed: dogs interbreeding with wolves.
2. To breed regularly with others of the same kind: a species as a group of individuals that interbreed.
v.tr.
To cause to interbreed.