![]() ![]() No other invertebrates have brains as complex as cephalopods. Most of the octopuses 500 million neurons are in its arms! This allows them to not only feel, but to taste and smell with their tentacles. The structure of an octopus brain is very unusual. The result is as close to an alien brain as you will find on earth. This means that octopuses developed brains independently from mammals. ![]() Most invertebrates do not have complex brains. This was long before life was as widespread as it is today. The invertebrates split from vertebrates’ evolutionary line over 600 million years ago. Cephalopod brains are very different from the brains of mammals. However, this is where the similarities end. This is a common sign of intelligence in animals. They have relatively large brains for their body size. Cephalopod brains are large and well developed like mammals.Ĭephalopod brains are unique. ![]() These sea creatures may seem strange, but we have something big in common. Most ( though not all ) have soft, boneless bodies, enabling them to squeeze through tiny spaces. Instead, cephalopod blood uses blue copper to carry oxygen. Cephalopods lack the red, iron-containing hemoglobin of humans. This taxon is very different from humans in many ways. Their name comes from Greek words for head and foot. Octopuses, squids, and cuttlefish are part of a larger group called the cephalopods. Learning is a key aspect of intelligence. Solving a maze or learning a behavior indicates that an animal can remember, and apply experience. Some traits such as memory and problem solving are often used. If you measure whether a crow or a dolphin is better at building a nest, your results won’t mean much. Any test may favor a species that needs that skill in the wild. Intelligence in animals is difficult to define. Your dog has an uncanny ability to know when you’re feeling down. Crows build simple tools, and make plans. However, many species show obvious signs of complex thought. Measuring the intelligence of animals is difficult. The questions of which animals are smart is far from simple. However, the competition might surprise you. You may think your dog is the smartest animal to have graced the earth. ![]()
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