Birds have a significant number of reduced muscles to help them reduce their weight. The most-developed muscles in birds are the flight muscles that they need to fly. The bones are mostly fused, reducing the need for muscles to hold the bones together. The skulls of birds are very thin and the beaks are very light.
Telophase is the last stage of mitosis. During Telophase, the cell splits apart and becomes two brand new cells. Hope this helps, tried to make it sound as simple as possible.
