Let me try again: every species is unique in so far as it is a distinct species, different from every other species, but that's not what we're talking about. No other species that I'm aware of, apart from humans, has abilities unique to it: flight, for example - most birds and most insects can fly. Bipedalism is shared by many creatures, as well. However, only humans can create complex language (as opposed to having a limited abiity to use human language), design and build complex tools and buildings, or have religious or philosophical ideas. Even chimps and gorillas can't do those things.
That 'creation of language' is a single thing: the religious and philosophical ideas are manifestations of that linguistic capacity. Dolphins (for instance) show altruism - they can't philosophically express it, but they apparently understand the concept. Bees can communicate complex navigational concepts using a physical language. Pigs have distinct sung names their mothers use. Chickens have in excess of 20 different alarm calls depending on the nature of the threat identified.
Elephants have a sense of smell that can not only differentiate substances but also relative quantities of those substances. And they have four kneecaps! Both unique traits.
Hummingbirds can hover, fly backwards and fly upside down.
Lobsters secrete a hormone that repairs DNA breakdown, meaning that they continue to grow throughout their lives and don't appear to suffer many of the frailties of age that afflict other animals.
Insects completely reform their entire physical structure metamorphosing from larvae to adults.
Goldfish can see in both the infra-red and ultra-violet spectra.
Sheep self-medicate on different plants to counter different ailments in the wild.
Rats come together as a colony to protect and care for sick members.
Turkeys and chameleons have entirely different, independent mechanisms for changing colour in response to mood.
Whilst the human capacity for purely academic and intellectual pursuits opens up a multitude more possibilities, I'm sure that it's qualitatively a different kind of unique to the others. I don't think we have special uniqueness, just a versatile one.
O.