Bird populations refer to the number of individual birds within a specific area or habitat. These populations can vary greatly depending on factors such as food availability, nesting sites, and environmental conditions. Scientists study bird populations to understand their health and the overall state of ecosystems. Monitoring bird populations is essential for conservation efforts. Changes in bird numbers can indicate shifts in environmental health, such as habitat loss or climate change. Organizations like the Cornell Lab of Ornithology and BirdLife International conduct surveys to track these populations and develop strategies to protect vulnerable species.