What type of pheromones helps animals to identify other species?

Territorial pheromones play a significant role in helping animals identify other species and understand their presence in a given area. These pheromones are often released to mark territory, signaling to other animals the boundaries of a particular space that belongs to an individual or a group. This chemical communication allows different species to detect and recognize not only the presence of others but also to potentially avoid confrontations with species that pose a threat.

While the other types of pheromones serve their unique purposes, such as attracting mates (sex pheromones), grouping individuals together (aggregation pheromones), or providing alarms within a species (epideictic pheromones), they do not primarily facilitate the identification of different species. Territorial pheromones, however, are specifically geared towards species recognition and understanding territory dynamics in the animal kingdom. This is why they are the correct answer for this question.