This article is worth reading in full:
Trapping Feral Pigs and Other Parables of Modern Life
by Matt Bracken
Professional trappers don't catch fast-breeding and destructive feral pigs using hunting dogs and guns, or in little traps one or two at a time. The wily pigs quickly learn to evade humans after such fleeting contacts. So how do the pros trap entire feral pig herds, eliminating them all, from granddads to piglets, in one go? They feed them, most generously. They kill them with kindness.
First, in a clearing in the woods, the trappers build an enclosure about twenty feet on a side and four feet high, made of stout wire mesh. There is an opening on each of the four sides of the pen. The pen is loaded with corn and other pig favorites. At first, the suspicious hog honchos will send in a few of the little ones as scouts. The scouts come and go at will, eating to their piggy satisfaction, until eventually suspicions die and they are joined by every other member of the herd right up the chain of command. The pigs soon come to believe that if nothing bad has happened to them after entering the strange wire enclosure full of corn, then nothing bad will ever happen. Their "normalcy bias" kicks in very quickly.
Soon, the pigs can't imagine any other life. Rooting for tubers? An unpleasant task of the forgotten past. Nightly the herd eagerly trots to the free corn in the pen, and they fail to notice when one of the openings has been closed off with another panel of wire fencing during the day. Pigs are said to be as smart as dogs, but neither can count to four. Nor are the closings of the second or third openings much noticed. Finally, all that remains for the trapper to do is to install a powerful spring-driven trap door above the last opening. The entire tribe of formerly wary feral hogs once again enters the pen, and with a metallic clang their miraculous corn nirvana turns into a death trap.
The moral of the story: If it looks too good to be true, it probably is. Don't go inside the "free corn" pen, not even when all the doors are open. Free food is as dangerous as the sirens' song to ancient mariners. It is all too easy to get used to being fed, and then to miss the exits closing one at a time.
2. The Turkeys and Farmer Brown
Pigs are Einsteins compared to turkeys. Turkeys are so stupid that care must be taken to prevent them from killing themselves by accident. For example, if incorrectly stimulated, they might stampede into a corner of a feeding lot and trample many of their brethren to death in their urgency to follow the herd.
If turkeys think at all, they think of Farmer Brown as "the food man" or "the food god." So you can imagine their simple and unreserved joy at seeing the food man arriving to dispense the daily manna. For 364 straight days they believe they are living in turkey heaven, and they worship the food man, until on day 365 he unexpectedly takes an ax to their necks. (Hat tip to Nassim Nicholas Taleb and his seminal book, "The Black Swan" If you have not yet read it, you are way behind the learning curve. It's waiting for you at your local library.)
The moral of the story: If somebody is feeding you every day and asking for nothing in return, give an occasional thought to his motives and his possible end plans. Not everybody that feeds you loves you. The normalcy bias can kill you.
3. The Buffalo Jump
Native American Indians hunted on foot before the arrival of Spanish horses in North America. Bows and arrows and spears were not showstoppers against stampeding herds of bison, each weighing up to a ton. The Indians understood bison much better than the bison understood the Indians, however, and so the bison repeatedly failed to discern that all the pesky humans waving flags and setting grass fires were funneling them into a narrow draw and then to a yawning cliff, with squaws and children waiting below to commence the butchery.
The moral of the story: If you are being stampeded and funneled, it might be toward disaster, not away from it. Take any exit and go another direction. Read about the then-Greek city of Smyrna in 1922 to see a human Buffalo Jump in action. Wiki link to the "Catstrophe of Smyrna"
4. The Lemmings
The lemmings we are interested in are the small furry rodents that live on islands around Norway. For most of history, their mass charges into the frigid waters were seen as some kind of group suicide. Today, they’re understood to be the result of the little rodent's rapid gestation period kicking into high gear during rare periods of abundance of seed grasses sprouting madly during particularly mild arctic summers. In a matter of months the lemming population explodes, but eventually every last seed is eaten, and not another seed will appear until after the passage of the long arctic winter. The starving rodents packing the small islands can either die in place or undertake a desperate swim to greener pastures on other islands beckoning in the distance.
The moral of the story: There doesn't need to be a pig trapper or a turkey farmer in the equation to cause a mass die-off event; nature can do it all on her own. And nature doesn't care about your schedule, or your personal problems.
5. The Land Crab Massacre
One day in Puerto Rico a platoon of Navy SEALs had to drive in a few trucks and vans to an isolated rifle range way out in some swampy corner of the Roosevelt Roads Naval Base, now sadly closed. A few miles of gravel road paralleled the Caribbean shore, with mangrove trees close on both sides of the narrow track. You had to access this rifle range at certain times during the daily tidal cycle, or the road might be under water. The frogmen spent the day shooting guns and blowing things up, then at sunset packed up the trucks for the quick run back to their beloved NavSpecWar Det Caribbean.
Truck headlights illuminated a moving sheet of land crabs, migrating from the ocean toward the land for the night. Land crabs have a body about the size of a fist, and one claw as big as a Maine lobster's. They were so tightly packed that you could not toss a hat into their midst without hitting two or three: a near solid mass of them covering a mile of gravel road and the mangrove swamps on both sides. All the SEALs could do was drive over them in their government trucks, pulverizing thousands of them, maybe millions, leaving two wide swaths of crushed crab, crackling and squishing beneath our tires for a mile.
On the return trip to the range the next day, not a sign remained of the land crab holocaust. The smashed crustaceans had been immediately devoured by their erstwhile kin, who were probably happy that the hard work of shell-cracking had already been done by Goodyear tires. A mile-long crab massacre was followed by a cannibal feast that left no trace, overnight.
The moral of the story: Don't be caught in the middle of a mass migration where you have no room to maneuver independently. Any outside force, or your neighbors, can smite you at will. Like Desert Storm's "Highway of Death," refugee columns attract warbird attention the way that honey attracts flies. History is full of refugee columns being strafed, on purpose or through mis-identification. Or like the bison, refugee columns can be herded into traps, and the individual refugee can do nothing to prevent it. This is a paradoxical case where the normally presumed “safety in numbers” is a deadly betrayer instead of a savior. Given a choice, going it alone beats The Buffalo Jump every time, but it’s very hard to bolt from the herd.
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Read the whole thing here:
http://www.freerepublic.com/focus/bloggers/2949909/posts?page=35
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