By Inc. Encyclopaedia Britannica
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Additional info for Britannica Illustrated Science Library Birds
ATTACKS AND COLLECTIVE AID Many birds that live in groups have developed several hounding behaviors in the presence of potential enemies. They perform them to help an individual that is in danger or is unable to flee. WARNING They emit callings that warn the whole colony. The great majority of species have a specific and characteristic cry that is usually simple, brief, and very audible. They often emit these warnings while adopting postures (such as stretching the neck or shaking the wings) that alone are enough to warn other individuals of the intruder's presence.
TONGUE From Parents to Children Flamingos and pigeons feed their young a special “milk” that is produced in the crop and has a nutritional value similar to the milk of mammals. Both males and females produce it as soon as food is ingested so that the chick is not fed regurgitated food. 2. A Complex System Feeding on microorganisms that live in salty water demands a complex filtration system. The flamingo's bill is specially suited to this task. Its tongue and throat pump the water inside the bill as they ascend and descend, bringing water through the hornlike lamellae, which resemble whale baleen, to retain the food passing through them.
1 2 3 Birds that have group behaviors usually develop group strategies to protect themselves against predators. Being numerous is a guarantee that the species will go on. They also adopt other tactics as a group. ESCAPE In the presence of terrestrial predators, a bird's first reaction is to take flight. If the bird cannot fly, it looks for shelter or a hiding place. COLONIES A great number of birds can defend themselves better from predators when in groups. For that reason they even form colonies with other bird species when raising their young.
Britannica Illustrated Science Library Birds by Inc. Encyclopaedia Britannica