Salivation at the sight of a steak is not verbal behavior for several reasons. The primary reason is that the response is not established and maintained by reinforcement; it is established and maintained by classical or respondent conditioning.
Behavior that has the following features:
It is established and maintained by reinforcement
The reinforcement is mediated by another person
The other person’s action that results in reinforcement must have been specifically trained in order to reinforce speakers
The topography of the behavior: which muscles are used in making the response
Dynamic characteristics of the response: speed, intensity, repetition
Verbal or non-verbal stimulus
Stimulus mode: auditory, visual, etc.
Reinforcement features