Optical illusions

Spot the hiding owl: Today's optical illusion is hard to spot, which is an owl blending into a woodland scene in this image. Spot it in less than 30 seconds ...

In the image, there is the strong bark of a tree, which makes a beautiful woodland scene. It is famous as a nocturnal bird that hunts during the night. Owl eyes are adapted in such a way that they help them see when it is almost dark. Is it really an owl hiding in this image? In the UK, some owls, like the Little Owl and the Short-Eared Owl, are diurnal, meaning that they hunt during the day. Whatever the reason, optical illusions seem to tell us something that is there when it is really not.