The ant thing isn't as far fetched as you'd think.
http://abcnews.go.com/Technology/Story?id=97591&page=2
"And then they move on again, devouring around 50,000 insects in a single day, according to Bill Gotwald, professor of biology at Utica College in New York and author of Army Ants: The Biology of Social Predation. Gotwald says if you imagine yourself being attacked by 50,000 wolves, you'll have some idea of what it's like being an insect caught in the path of army ants.
There are reports of army ants killing animals the size of a horse, but Brady says he's not sure of the reliability of those reports. A calf, maybe, tied to a tree and unable to get out of the way.
"They are ferocious enough that I'm sure they could kill a baby cow that was tied up," Brady says."
http://www.environmentalgraffiti.com/ecology/the-five-most-dangerous-insect-swarms/937
'Army ants are another species that wouldn’t be particularly dangerous individually. That doesn’t matter though, because these bad boys stick together and boy do they get nasty. Army ants are swarm raiders, hunting in massive groups above ground. They don’t have a permanent home, but move constantly as a colony. If they come across prey, they attack en masse. Pretty much anything that they come across is ripped apart piece by tiny piece with their small but powerful jaws. This includes livestock. There are legendary, and quite possibly true, tales of the ants enveloping cows, moving on a short time later leaving nothing but the animal’s picked clean bones. Finally, their cooperative nature means they can overcome almost any obstacle. When faced with small bodies of water the ants can cling together with their claws to form a kind of living bridge, which the rest of the colony can then cross as it searches for more food. An army ant swarm is one of the most efficient eating machines in existence."
http://abcnews.go.com/Technology/Story?id=97591&page=2
"And then they move on again, devouring around 50,000 insects in a single day, according to Bill Gotwald, professor of biology at Utica College in New York and author of Army Ants: The Biology of Social Predation. Gotwald says if you imagine yourself being attacked by 50,000 wolves, you'll have some idea of what it's like being an insect caught in the path of army ants.
There are reports of army ants killing animals the size of a horse, but Brady says he's not sure of the reliability of those reports. A calf, maybe, tied to a tree and unable to get out of the way.
"They are ferocious enough that I'm sure they could kill a baby cow that was tied up," Brady says."
http://www.environmentalgraffiti.com/ecology/the-five-most-dangerous-insect-swarms/937
'Army ants are another species that wouldn’t be particularly dangerous individually. That doesn’t matter though, because these bad boys stick together and boy do they get nasty. Army ants are swarm raiders, hunting in massive groups above ground. They don’t have a permanent home, but move constantly as a colony. If they come across prey, they attack en masse. Pretty much anything that they come across is ripped apart piece by tiny piece with their small but powerful jaws. This includes livestock. There are legendary, and quite possibly true, tales of the ants enveloping cows, moving on a short time later leaving nothing but the animal’s picked clean bones. Finally, their cooperative nature means they can overcome almost any obstacle. When faced with small bodies of water the ants can cling together with their claws to form a kind of living bridge, which the rest of the colony can then cross as it searches for more food. An army ant swarm is one of the most efficient eating machines in existence."
