Great Snakes!

The United States is being invaded!! Hundreds of thousands of slimy aliens are slithering around the sacred homeland.

And so, the United States is defending itself. War has been declared on these intruders. Patrols are being mustered to track down these sneaky, elusive aliens. Beagles are being trained to sniff them out. Scientists are working on miniature airborne drones, like the ones used by the armed forces in Afghanistan, that can detect the heat given off by these aliens from the air. Open season has been declared, and from March 8 hunters can buy the right to shoot these aliens for a $29 fee. Officials are even training hunters on how to identify, stalk, capture and remove these aliens.

What crime have these aliens committed? Nothing more than trying to stay alive. They haven't even attempted to cross an international border illegally. Why so much fear and hatred?

The aliens I am sticking up for here are snakes, specifically pythons. Thousands of pythons have been imported into America as pets. Some were released by owners who bought cute little things a few inches long, and found they had more snake than they could handle when their tiddlers grew into 15 foot long giants. Some escaped when Hurricane Andrew ripped through Florida, destroyed a pet store's warehouse, and air lifted python hatchlings in their frizbee-like flat-pack plastic containers out into the Everglades. Most of the ex-pet snakes died. But enough survived in the warm, humid swamps of the Everglades, a climate which may not be all that different from the Asia they came from, to establish a breeding population. There are now an estimated 150,000 pythons in the Florida wilderness.

The campaign against pythons claims that they are dangerous. They are dangerous. A two year old sleeping in her crib was tragically killed by a python, which belonged to her mother's boyfriend. This incident has little bearing on the rights and wrongs of pythons in the wild, but it clearly is bad PR for pythons.

Some ecologists worry that pythons prey on endangered native species, like the Key Largo Woodrat. These same ecologists are also clearly aware of the media potential of a "foreign invader drives local species to extinction" storyline. Consider this New Yorker article, easily the most thoughtful piece I've read on this topic. It carefully refers to the python as the Burmese python at every instance, to emphasize its foreignness, even though the python's range extends from the Himalayas through Indonesia. I was appalled at the cynicism of this extract:

Skip Snow, a wildlife biologist at the Everglades national park, was dissecting a python that had been caught in Summerland Key, one of the southernmost of the Florida Keys. He unspooled the snake...lifted it on to the counter, stuck a scalpel in it, and unzipped it like a ski bag, and examined its guts....Snow's purpose, in this case, was mostly political. If he could prove that the pythons were eating endangered (native) species, it would be much easier to lobby for funds.

The question that is not addressed is why exactly the Key Largo Woodrat is more valuable than the python. And who is to say that the Key Largo Woodrat would not have died out anyway?

Yes, invasive species can destroy ecosystems. I had blogged earlier about a tiny aphid called the Woolly Adelgid destroying Eastern Hemlock stands in the Appalachians. The Red Lionfish, a native of the Pacific, has emerged as a super-predator in the Caribbean coral reefs, and is now threatening these (valuable) ecosystems.

There may well be a case for acknowledging the law of intended consequences, and drastically cutting down on the international trade in exotic species. Who anticipated that importing decorative water hyacinth from South America would choke the life out of South Indian waterways? But slaughtering hundreds of thousands of pythons is not going to stop that on-going global species trade.

In all likelihood, this war on the python will fail despite the beagles, the drones, the "open-season" hunters, and all the attendent cruelty. A case of shutting the stable door after the snake has bolted. Many of the scientists involved in python war acknowledge that "In one week we went from 'No problem at all' to 'You might as well give up'". Pythons are omnicarnivorous, they eat almost anything that moves. They breed fast, a single female python can lay up to a hundred eggs in a single clutch. They are already extending their range north, beyond the Florida peninsula. They could find climatic conditions that match their Asiatic range across all the Southern states, and portions of Texas, Oklahoma, Arizona and California (map below). Why not just accept the inevitable and embrace a new vision of an American future, one in which the python is as much a part of the American south as the alligator?