In the History Channel's "Life After People", there aren't. Now I haven't seen the documentary, but from the website it's pretty clear that they are describing a world sans us. What I found most interesting about this website, with video excerpts, was the "Can You Survive" section. It was pack with useful/life saving information such as if you don't have water, don't eat food. Did not know that. There is also small section, "Fate of the Animals". Who do you think will evolve into the role of top dog? I'll give you a hint, it ain't the dogs.
"If you have water, you can eat. Otherwise, don't--the digestion of food can speed up dehydration. To survive a disaster, first look to canned and dehydrated foods for nourishment. As soon as you can, create a garden using seeds found in decaying vegetables and fruit. Other food options include indigenous vegetation, bugs and small wild game like squirrels and rabbits. Don't eat any vegetation or bugs that you can't identify as edible. To avoid a parasitic infection, bugs should be cooked whenever possible..."
It's kind of creepy to imagine how the human race will come to an end. See for yourself.