Octopuses have a doughnut-shaped brain which is wrapped around their oesophagus

Octopuses are some of the most weird, clever, and overall fascinating animals on our planet. Their brains have as many neurons as a dog's brain has, while it's doughnut-shaped to add to their alien-like characteristics. Their brain is wrapped around their oesophagus, so they've got to pay special attention to the size of their meal.