Whether animals can experience romantic love is unknown. But there is some evidence that they are capable of experiencing the same range of emotions as we can. The brains of many mammals are surprisingly similar to the human brain. Take as an example the brain of a cat. A cat’s brain is small compared to ours, occupying only about one percent of their body mass compared to about two percent in an average human. But size doesn’t always matter. Neanderthals, the hominids that went extinct more than twenty thousand years ago, had bigger brains than Homo sapiens, but they probably weren’t smarter than the Homo sapiens that beat them in the survival game. Surface folding and brain structure matter more than brain size. The brains of cats have an amazing surface folding and a structure that is about ninety percent similar to ours. This suggests that they could indeed be capable of experiencing romantic love. But we will probably never know for sure.