In terms of animal welfare, what does the term 'warm-blooded animals' refer to?

The term 'warm-blooded animals' refers to those species that can regulate their body temperature internally, maintaining a relatively constant temperature regardless of the external environment. This ability is found primarily in mammals and birds.

Mammals are well known for their endothermic capabilities, allowing them to thrive in various climates. Birds also exhibit this characteristic, which is vital for their metabolic processes, especially considering their high activity levels and the energy demands of flight.

Reptiles, on the other hand, are classified as ectothermic, meaning they rely on external sources to regulate their body temperature, making them unsuitable for the classification of warm-blooded animals.

Therefore, the inclusion of both mammals and birds in the definition aligns with the understanding of warm-bloodedness in the context of animal welfare. This makes the selection correct, as it encompasses the two major classes of animals that are known for this physiological trait.