Why do mammals and birds need to eat more regularly than members of the sub group?

Mammals and birds are endotherms, meaning they maintain a constant body temperature. To do this, they need to constantly produce heat, which requires energy in the form of food. In contrast, ectotherms (such as reptiles and amphibians) rely on external heat sources to regulate their body temperature, so they can go for longer periods without eating.

Here are some additional reasons why mammals and birds need to eat more regularly than ectotherms:

High metabolic rate: Mammals and birds have a higher metabolic rate than ectotherms, which means they burn through energy more quickly. This is due in part to the fact that mammals and birds have more complex physiological systems, including organs such as the heart and lungs that are constantly working to maintain homeostasis.

Larger body size: Mammals and birds are generally larger than ectotherms, which means they have more tissue to maintain and repair. This also increases their energy needs.

Active lifestyle: Many mammals and birds are very active animals, which further increases their energy needs. For example, birds may fly long distances during migration or while searching for food, while mammals may run, climb, or swim for extended periods of time.

As a result of these factors, mammals and birds need to eat more regularly than ectotherms in order to maintain their body temperature, high metabolic rate, and active lifestyle.