It doesn't happen often, but workers at the Houston Zoo were surprised a few weeks ago by an unexpected birth. It happened in the primate department.

On New Year's Eve, one of the zoo keepers discovered a new baby De Brazza’s guenon.

As described in a blog on the Houston Zoo's website, the celebrating began once workers recovered from the shock.

The baby monkey is only a few weeks old, but it already has an interesting history.

Its parents were imported from the Democratic Republic of Congo in central Africa. The pair was confiscated after their discovery in an African bushmeat market. The female, Amelia, and the male, Albert, have been in the United States since 2006.

According to the zoo's blog, workers were impressed with Amelia’s calm demeanor as she groomed and nurtured her new infant. She seemed completely at ease in her new role as a mother, while Albert seemed quite protective of his expanded family.

Since the entire family seems to be doing so well together, the zoo has decided to leave them in place until the infant is older so as not to disturb them.

>>Click here to see more photos of the Zoo's new addition.