In most species, migration consists of periods of rest and feeding when body reserves are accumulated, interspersed with periods of flight when these reserves are used. Both activities need to be...
Category: Wild Birds
Successful migration depends on weather conditions, which influence the times when birds can travel safely, the energy costs and risks of the journey, and the visibility of any celestial or...
The most efficient flight won’t be enough to help birds migrate successfully if they don’t have enough energy to make the trip. Several weeks before traveling, changing sunlight levels trigger...
Birds in preparation for migratory flight ate intensively and laid down subcutaneous fat reserves at a remarkable rate, increasing their mass by as much as 50 percent in a matter of...
Birds are also pre-adapted for long-distance migration in ways other animals are not. One of the main advantages of flight is its speed, which is much faster than the alternatives of walking,...
Human activities are modifying the chemistry and physics of the atmosphere, as well as the characteristics of the land surface, freshwater lakes and streams, and oceans. These changes are altering...