Birds have undergone many structural adaptations to suit their aerial life. Some of these adaptations are as follows.
`implies` Streamlined body for rapid and smooth movement Covering of feathers for insulation
`implies ` Forelimbs modified into wings and hind limbs used for walking, perching, and swimming
`implies` Presence of pneumatic bones to reduce weight
`implies` Presence of additional air sacs to supplement respiration
