Are birds mammals?

Birds, on the other hand, are not mammals. Birds are classified as a separate class of vertebrate creatures known as Aves. Mammals, on the other hand, are classified as Mammalia and are distinguished by the production of milk for their young, four-chambered hearts, fur or hair covering the majority of their body, and warm-blooded bodies. Birds have feathers and beaks, and they lay eggs, indicating that they are not mammals. Furthermore, there are some significant physical distinctions between birds and mammals. Birds, for example, have hollow bones filled with air sacs, making them lighter than most mammals; birds also lack sweat glands, nipples, and mammary glands, and have a four-chambered stomach to digest their food.

In terms of reproduction, the two types of animals differ as well; birds lay eggs, whilst mammals give birth to live young. Finally, birds have wings that allow them to fly, but most mammals are unable to do so. All of these distinctions demonstrate that birds and mammals are two different groups that are not linked.