A frog is an amphibian, not a mammal. Amphibians are a class of animals that can live both in water and on land, and frogs are one of the most well-known examples of this group.
Frogs begin their life cycle as eggs laid in water, which hatch into tadpoles. These tadpoles are aquatic and breathe through gills. As they mature, they undergo a transformation called metamorphosis, developing legs, losing their tails, and transitioning to breathing air with lungs. This ability to adapt to both aquatic and terrestrial environments is a hallmark of amphibians.
In contrast, mammals are warm-blooded animals that typically have fur or hair and produce milk to feed their young. Frogs do not share these characteristics and, therefore, are classified as amphibians. Understanding these distinctions helps clarify the remarkable diversity among animal life on our planet.