My Mom discovered koolaid can have this same effect when she rushed me to the pediatrician in horror at the color of the stuff in my diaper. This was the '70's, so I'm not sure if it's still true. My family identified several colors not found in the crayola box as things like "baby-poop yellow" "baby-poop green" etc..
I heard an interview yesterday on NPR with a guy who wrote a book about rats, and he said that if there's a plague scare and we kill off all the rats using some draconian poisoning program, the fleas that carry the plague will just jump from the rats to us.
Also, rats can chew through steel and concrete. But that's not important right now.
And I have a Bat Protection Hat somewhere which my dad found in Belize during a campaign to persuade the locals that the bats were good bug- and pest-eating little friends, not evil nightmares. It's too ugly to wear (orange and navy?) and too big for me, but I have proof of my bat-friendliness, dangit.
I just saw the caption under the pic in the link. I live in Jalisco. Those bats are quite common here and a threat to cattle but we never heard they attacked people... Bees and wasps on the other hand... *shudder* Nasty vicious little creatures.
I'm a big fan of chiroptera, so I admit I'm extremely biased about them.
They seem to be getting more avid about attacking stuff you wouldn't normally expect, from all reports I've found. Are cattle farmers giving up on the area and taking away an easy foodsource? There has to be some reason for them to be picking a hard target, preywise. They are vicious little creatures, it's true. Their saliva glands also produces some of the most powerful anticoagulants known to mankind, which has produced remarkable strides in medical means of dealing with cardiac issues, as well as surgery: it's quite possible that I wouldn't be here without some of the research they prompted. Vampire bats are also a completely unique chunk of the mammal order, which subsists on a foodstuff that's plentiful- yet inedible to most mammals. There's a lot with them that we could learn- provided we don't screw up the planet so bad they're no longer there to learn from.