Animal studies indicate that

mammals may be relatively better at solving problems than birds

birds have far superior reasoning skills when compared to other animals

animals do not learn from previous experience

animals are incapable of solving problems in their environment

The correct answer is: mammals may be relatively better at solving problems than birds.

The most famous example of problem solving animals are chimpanzees. It has been shown that those apes are capable to solve problems that require abstract reasoning. These days birds are observed for causal reasoning and it is shown that rooks and crows are capable for problem-solving tasks.