Riddles and visual challenges have always attracted people’s attention. To solve the most common puzzles, we have to appeal to the imagination and deduction rather than reason, which is why they’re a good exercise for people of all ages.

Being sharp-eyed and detail-oriented has its advantages. It makes you an expert at I Spy, and you’re frequently the first person to see the beach on a road trip. When you watch crime series, you may notice nuances that help you solve the mystery before the detective.

Most importantly, you’re quick to locate misplaced keys, TV remotes, and wallets. But can you spot the error in these photos? At first glance, this may appear to be a standard photograph of two trains, but did you notice the animals? Here’s the solution: