They look as if they're floating. It's really cool. Colobus are very social. They live in large groups of mostly related females with one adult male. All the females help care for all the babies.
Young females help, too, which is good training for when they become mothers themselves.
Like some people, colobus are easily stressed. The females get very upset and can even get ulcers if the adult male leaves the group or gets killed. Without him, they feel unprotected. At a certain age, they get driven out of the group by the adults. Then they try to find another group and replace the dominant male.