Here's the description of Ben 10's Spider Monkey alien form. [Source Ben 10 Wiki Planet]
Spidermonkey or Spider Monkey is an alien with 4 arms, 4 eyes and 2 legs, a feature Spidermonkey has in common with Fourarms and Stinkfly. Spidermonkey can spin webs from his tail which were at one point stated to be as strong as steel, although it can be shredded, only by strong enemies though. He has supernatural adhesive skills, and has superhuman agility. He can also swim. In the episode Birds of a Feather, Simion, an Arachnichimp, said that their ears are better than humans, so he may have a highly strong sense of hearing, too. He is also good at hand-to-hand combat. He also has above average strength (stronger than a human) as seen in Absolute Power: Part 2 when he hit Kevin with a metal pole which sent him flying.