In the DC Universe there are plenty of intelligent beings, but few are as unique as Detective Chimp. As you might surmise, he is indeed a chimpanzee, but he is also one of the smartest creatures in DC Comics.
His is so intelligent that he became a detective, and even dresses up like Sherlock Holmes to solve cases. He has also been a part of many superhero teams, including the Justice League International and Shadowpact.
As for Batman, he fully respects Chimp in every way, and in some ways, more than others ever will. For he values his intelligence, and never cares that he happens to be a monkey.