Birds evolved from reptiles during the Mesozoic Era. The ancestors of birds are reptiles. Reptiles have evolved into birds. In the early 20th century, the famous ornithologist Thomas Huxley called them birds as the majestic reptiles. Archeopteryx is a fossil link between reptiles and birds. That is, archeopteryx evolved from reptiles and birds evolved from archeopteryx. The characteristics of the creation of birds from reptiles are-
1. Reptiles are cold-blooded animals with low metabolic rates. Birds are high-blooded animals with high metabolic rate. Dr. Siddiq Publications
2. Reptiles are mobile animals. Birds can move faster due to the gain in flight ability.
3. Reptiles have dry fibrous bodies. Bird feathers have been created from the dung of reptiles. Dr. Siddiq Publications
4. The four-chambered heart of a bird has been created from the incomplete four-chambered heart of a reptile.
5. There are two systemic arches in the circulatory system of reptiles and one systemic arch of birds.
6. The renal portal system of reptiles is highly developed. It is decaying in birds.
7. The jaws of reptiles gave rise to the long beaks of birds.
The above discussion proves that birds have evolved from reptiles. That is, birds are majestic reptiles.