据下面提供的图片资料,归纳鸟类动物适于飞翔的特点。
(1)体型及体表覆盖物____________________________________________________;
(2)前肢及肌肉___________________________________________________________;
(3)呼吸方面______________________________________________________ ____;
(4)骨骼_________________________________________________________________;
(5)消化及其他方面______________________________________________________;