This optical illusion involves finding a hidden frog in a dense forest within 5 seconds. The frog's color blends with the foliage, making it difficult to spot. Only 1% of people have successfully found the hidden frog. The key hint is that the frog's color matches that of the foliage. If unable to find the frog, it is located in the left corner of the image. The frog's eyes are cleverly hidden within a leaf.