Coccygeal bone is formed by the fusion of ____ bones in man

A) 3 vertebrae

B) 6 vertebrae

C) 5 vertebrae

D) 4 vertebrae

Migratory birds are a group of birds capable of flying long distances away from their usual habitats. For many species, migration is a regular seasonal event, most commonly observed in the northern hemisphere. Migration often takes place during the winter season, when colder conditions and reduced food availability force birds to move to warmer regions.

This movement ensures better chances of survival by providing access to food sources and more favorable conditions for breeding and raising young ones. Warmer climates generally support the availability of food and suitable nesting environments.

The distance of migration varies greatly among species. Some birds practice partial migration, covering only short distances, while others are capable of traveling thousands of kilometers across continents. The timing of migration is often influenced by changes in day length, which act as natural signals for birds to begin their journey.

Hence, the correct answer is option (A) Climatic, as migration is primarily triggered by environmental and climatic changes.

Note: While migration has clear advantages, such as survival and successful breeding, it also carries risks. Birds face threats like increased predation, exhaustion, and mortality due to hunting by humans.