Final answer:
The statement is false; animals often defend their territories against intruders of different species, not just their own, through various territorial behaviors including display behaviors and even physical aggression.
Step-by-step explanation:
The statement that territorial behavior does not extend to organisms of different species is false. Territorial behavior, which can include both aggressive interactions and display behaviors to assert dominance over a given area, is not exclusive to interactions within the same species. In fact, many animals will defend their territories against any intruders, which can include members of different species, as well as animals and even humans, as is the case with Australian magpies. Territory defense is an adaptation to ensure adequate resources for the survival of themselves and their offspring, especially in environments where food is scarce. The territorial defensive behavior of animals like penguins, for nesting, and male gorillas, who use displays to ward off competitors, are examples of how display behaviors are used to claim and maintain territories without the need for physical conflict, conserving energy.