A lot of non-human animals out there will find this a very baffling notion. They see humans as having dull senses and very poor observational skills. But I say, just look at some human inventions, such as television, yo-yos and twenty20 cricket. To investigate this anomaly let's look at Clever Hans.
Clever Hans was a horse that was taught to do difficult mathematics. He would stamp his foot to give the correct answer. It turned out he was picking up on subtle body language from the humans around him to know when to stop stamping his foot and give the correct answer. He couldn't do maths at all.
Elizabeth Marshall Thomas makes a good point about Hans in The Social Lives of Dogs, "Today his name is synonymous with hoax and fraud, since few seem willing to acknowledge that, as the only one in the barn who noticed the various, extremely subtle signals in the body language of questioners, he proved himself to be a better observer than the most prominent scientists of the day."
It is not that humans are less intelligent, it is just that they have a different intelligence. Because they are sometimes wrapped up in their thoughts, ideology, worries, selves and stress, they can appear to be a few kangaroos short in the top paddock. Yet they show flashes of genius. So the jury is still out.
Life is great when you go on a morning walk.