You would be surprised to find just how many mammals have similar brains to ours. Studies haven’t been able to conclusively prove that any animals experience love the way humans do. But if you’ve ever seen a pair of swans swimming together side by side, or two penguins walking flipper in flipper, you know love spans the animal kingdom. Anyone with a dog (and sometimes a cat, when they’re in a good mood) has seen that love first hand.

So here are some of the sweetest photos that show us love has no boundaries – a picture says 1,000 words!