Dogs and hairless monkeys are pack animals. A combination of negative and positive reinforcement works in a social context. Humans have a fair instinctive understanding of the workings of the dog mind. Even with pack animals behaviors ingrained by positive reinforcement have a slower extinction rate than behaviors generated with negative reinforcement.

Hawks are essentially solitary animals. They have enough forward planning capability to recognize a cue signalling a delayed reward from a behavior. Their ability to link a negative reinforcement is very limited. By and large the negative reinforcement must be very immediate and have no social context to be effective.