Major objective of this lecture is to present on Bird Biology. Here briefly present six characteristics of Birds; they are: Endothermic (warm blooded), Vertebrates (Hollow Bones!), four Chamber Heart, All Have Feathers, All Lay Eggs and Have Scales on Feet and Legs. Here also briefly present on how do birds fly. Finally describe on Migration. Regular periodic journey from one place to another for food, reproduction or warmth.