spiders
Jumping spiders seem to recognise each other if they’ve met before
Regal jumping spiders in a courtship display before mating FLPA/Alamy Jumping spiders seem to be able to tell each other apart, putting them among just a few other invertebrates that are thought to have this skill. Recognising individuals within your species is important for social animals, such as primates, but just a handful of invertebrates…