This category contains all birds.

Birds are tetrapod animals that first evolved on Earth from theropod dinosaurs, making birds the last living lineage of living dinosaurs. Birds are characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a lightweight but strong skeleton. They rank as the class of tetrapods with the most living species, at approximately ten thousand. Birds are classified as such:

  • Kingdom: Animalia
  • Superphylum: Deuterostomia
  • Phylum: Chordata
  • Subphylum: Vertebrata
  • Clade: Dinosauria
  • Class: Aves

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