1. The skin is dry without glands except the oil gland at the base of the tail. 
  2. They possess beak.
  3. The hind limbs are modified into wings.
  4. The presence of feathers and most of them can fly except flightless birds.
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1 Answers

Option 3 : The hind limbs are modified into wings.

The correct answer is The hind limbs are modified into wings.

  • Forelimbs and hindlimbs are found on birds. The forelimbs are transformed into wings.
  • Scales cover the hindlimbs, which are specialised for walking, jumping, and grasping tree branches. Birds have a warm-blooded nature.
  • Aves are a group of endothermic animals that include birds.
  • These animals belong to the Chordata phylum and have characteristics such as toothless jaws with a beak, hard-shelled eggs, and so on.
  • In the terrestrial animal realm, there are an estimated 9000 Aves species. This species' most prominent attribute is its ability to fly.
  • Their skeletal structure, which is made up of strong but hollow bones, allows them to fly.

  • The fact that they are bipedal feathered animals is one of the most noticeable traits of the Aves class.
  • Birds' forelimbs have evolved into wings that allow them to fly.
  • Their back limbs have evolved into legs that aid them in swimming, walking, and other activities. Birds' legs often have four toes.
  • Two or three toes, on the other hand, are rarely noticeable.
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