Sometimes, we are truly amazed by the love animals have for each other in the wild, like when this wild red wolf was caught lovingly cleaning snow off its mate, or when this swan waited for her mate to return to her after rehabilitation. We know they are animals, that they are different than us, but their love for each other seems to be just as strong sometimes if not stronger.
That's the only way to explain the amazing behavior of this goose. Her mate was injured and taken into surgery, and she - clearly concerned - walked up to the clinic where he was being taken care of, tapped on the door with her beak, asking to be let in, and when she wasn't given the option, she simply stayed there and watched her mate the entire time. That's animal love. It can be nothing else.