Chemical signals sent between two animals fall under exocrine communication. In this context, exocrine signaling involves the release of chemical substances into the environment through ducts, which are then detected by other animals. This type of communication is crucial for various behaviors such as mating, territory marking, and social interactions, as it allows one individual to influence the behavior or physiological state of another directly through chemical cues in the surroundings.
Neural communication involves the transmission of signals along neurons, which is specific and typically rapid, but it usually occurs within a single organism rather than between different animals. Endocrine signaling, on the other hand, involves hormones released into the bloodstream to exert effects on distant tissues within the same organism. Autocrine communication refers to a cell releasing signals that bind back to its own surface receptors, influencing its own behavior or activity, which again does not apply to inter-animal interactions.
Thus, exocrine communication effectively describes the transfer of chemical signals specifically between different animals.