I never actually considered that they couldn't plan ahead. But then again I never really thought about it.

Researchers found the apes could select a suitable tool for reaching a treat, carry it away, and return with it to retrieve the reward hours later.
Forward planning is thought by some to be a uniquely human trait.
The German team suggests such skills may have evolved about 14 million years ago, when bonobos, orangutans and humans shared a common ancestor.
This skill could have been present in the common ancestor to all great apes
Dr Josep Call
"We showed that individuals are able to pick up a tool, transport it to a different location, keep it there for at least an hour, and bring it back to solve a problem," explained lead author Dr Josep Call, from the Max Planck Institute for Evolutionary Anthropology.
Source: news.bbc.co.uk..." target="_blank" class="postlink" rel="nofollow">BBC.co.uk
in May 2002, the single most studied chimp in the world, named Frodo, leapt upon a woman walking through the Tanzanian jungle. He snatched the baby the woman was carrying on her back, climbed to the top of a tree and ripped the child’s head off...how human an act was Frodo’s assault upon that child? Was it premeditated – or something more primitive?