What animal behavior discoveries are revealing about intelligence and social complex

[MatthewLW]

I've been fascinated by recent animal behavior discoveries that keep pushing the boundaries of what we think animals are capable of. From tool use in species we never expected to complex social structures and even what looks like culture in some animal groups. These biology eye opening discoveries are challenging our anthropocentric views of intelligence and social complexity. Some findings suggest we've been underestimating animal cognition for decades. What animal behavior discoveries have you come across that made you rethink what animals are capable of?