So they would have made it if.....

Yep, they would have gotten away with it if it weren't for those meddling chimps!

Ah, the power of grape juice +. It was the 70s after all. When Zira and Cornelius were on the run with the baby chimp, didn't they leave behind a blanket or a piece of clothing in their rushed pace to hide. That certainly didn't help conceal their tracks.