Only the people with the sharpest eyes and minds will be able to spot the odd creature out in the picture above in under 17 seconds.
The drawing, by Hungarian artist Gergaly Dudas, shows a group of tortoises standing in a field.
However, they are not the only creatures visible in the picture. There is also a snake hiding in plain sight amongst them.
The rogue reptile is distinguishable by the fact it does not have a shell.
It’s not easy to spot the snake quickly – but if you can do it then it shows you have good eyes and attention to detail.
There are a number of things in this brainteaser that make it more difficult than it might at first appear.
Firstly is the sheer amount of green in the drawing, not just the tortoises and the snake but also the grass, leaves and the rest of their surroundings.
A number of the tortoises also draw your attention away from looking from the snake – including one that is sporting a top hat and another pulling a broad grin.
Have you spotted the slippery serpent yet? If not then the solution is above.
The snake is hidden on the left hand side of the image, poking its head up from behind the shell of a nearby tortoise.
Are you looking for more brain puzzles to try and solve? If so, there are many others at express.co.uk that you can look at to test your skills.