This captcha had me puzzled for a minute.
It asked that I "click on all images containing the largest animal in real life."
I wondered, "Largest compared to what?" That hummingbird is larger than the bee. That crab might be bigger than the hummingbird. Or, is it a spider? And there's another crab, but it looks like a fiddler crab, which is smaller than a hummingbird. The tortoise is big, but it's not as big as a lot of other animals in real life.
Finally, I saw the prompt pictured a turtle. So, basically, they were saying, "Click all turtles."
Guess I was overthinking things. #coffeechain