Mammals have many unique characteristics, some of the main ones include:
Breastfeeding: Mammals get their name from their unique way of breastfeeding. They produce specialized mammary glands to nurse their young, a characteristic unique to mammals.
Thermostat: Mammals are usually able to self-regulate their body temperature to maintain a relatively constant internal environment, an ability called homeotherm.
Hair: Most mammals have body hair, but there are some exceptions, such as the long-tailed naked mole rat.
limb structure: Mammals have a wide variety of limb structures, including claws, hooves, wings, and fins.
Advanced brain: Compared to other animals, mammals usually have relatively more complex brain structures.
Producing live offspring: Mammals generally give birth to offspring via endoviviparous or oviparous methods, and a degree of care and protection is usually provided.
These characteristics make mammals occupy a unique position in the animal kingdom, and their ecological roles and behavioral habits are also significantly different from other groups.
