Final answer:
The question of which animal is least intelligent is subjective, but some may consider the turkey to be less intelligent by common perceptions. The llama is the animal from the choices provided that originated in the New World. Cortical folds and social complexity might suggest higher intelligence in socially complex animals.
Step-by-step explanation:
The question "Which of these animals is considered the least intelligent?" does not have a straightforward answer because intelligence can be difficult to measure and is not universally defined across species. However, based on common perceptions and limited comparative understanding, some may consider the turkey to be among the less intelligent on the list, but this is a subjective assessment rather than a scientific fact. It is important to note that each animal has adapted intelligence for its specific environment and survival needs.
In the context of the references provided, the animal that did not originate in the Old World of Europe, Africa, or Asia is the llama. This information does not directly pertain to the question of intelligence, but provides the clear answer that llamas are native to the New World, specifically South America.
If we consider the potential relationship between cortical folds and social complexity, we might infer that animals with more developed social structures, such as dolphins, display a higher level of intelligence. But again, this is not directly related to the original question.