* Intelligence is complex: Intelligence isn't a single, measurable quality. Animals exhibit different types of intelligence (spatial reasoning, problem-solving, social skills, etc.) and it's hard to compare them across species.
* Defining "dumb" is subjective: What we consider "dumb" in an animal might be perfectly adaptive for its environment and lifestyle.
* Limited research: We haven't fully studied the cognitive abilities of every land animal, making it difficult to make definitive comparisons.
That said, some animals are often cited for their seemingly simple behaviors or limited cognitive abilities, like:
* Slow lorises: These primates are known for their slow, deliberate movements and lack of complex social interactions.
* Koalas: These marsupials are often portrayed as sleepy and unintelligent, although they have complex social structures.
* Axolotls: These amphibians have relatively simple brains and are often described as lacking complex cognitive abilities.
It's important to remember that labeling any animal "dumb" is misleading and disrespectful. Every species has its own unique strengths and adaptations that allow it to thrive in its environment.