Think about how well you can understand what a cat is communicating to you. That’s a lot more understanding than most species have for most other species, and it’s still not much. Some animals do communicate across species, but only ones that have specifically evolved to do that and formed pseudo-symbiotic social relationships (for example, there are cases where you have two herbivore species who know the other species’ warning calls mean predators are about). Even then though, whether or not they really *understand* the other species is debatable. They evolved to have a “run away” response when they hear the warning call, but that doesn’t mean they understand that the warning call is a warning call.
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