Summerville, South Carolina is home to a semi-clandestine sanctuary, The International Primate Protection League (http://www.ippl.org/)
To you and me, they're monkeys. But since gibbons don't have tails, technically they're apes. Regardless, they swing effortlessly from thick ropes never once missing.
It's not open to the public. Fortunately, we know someone that knows someone. On more than one occasion, we've walked the whoop-whoop grounds beneath the tunneled cages. Every gibbon on the property has been rescued for one reason or another and supported by donations from around the world.
They are paired in large cages, male and female. Some are charming, others not so much. These seemingly diminutive furballs are cute enough to cuddle with incisors long enough to eat your face. They'll reach through the bars and, on certain occasions, we can touch their soft pads.
Their gaze is intelligent. Reminds me we're not the only ones that think.
We're just more likely to get ourselves in a mess doing it.