This is an example of CONDOMINANCY.
Condominancy is said to occur when two different alleles are combined together to form a different allele, in which the alleles are expressed equally and none of them is dominant. In the example given above, the black rat population mated with the white rat population to produce offspring that are grey in colour. Thus, the white and the black colour of the parents are not dominant, but are equally expressed to give gray colour.
By having different interests and hormones
A coyote would most likely be at the top because it is the only carnivore. Carnivores tend to be on the top, because they eat other animals (usually plant-eaters).
