Explanation:

- Butterfly: Butterflies are insects and are cold-blooded. They rely on external heat sources to regulate their body temperature.

- Pigeon: Pigeons are birds and are warm-blooded. They maintain a constant internal body temperature regardless of the environment.

- Frog: Frogs are amphibians and are cold-blooded. Their body temperature changes with the external environment.

- Cat: Cats are mammals and are warm-blooded, meaning they regulate their body temperature internally.

The warm-blooded animals in the list are pigeons and cats.

- Correct Answer: Option: 2, Pigeon and Option: 4, Cat.