Planting trees impacts bird populations negatively when it happens in natural, non-forest ecosystems like grasslands or agricultural wetlands. Tree-planting displaces open-habitat specialists (e.g., larks, pipits) because trees fragment their habitats and provide perches for predators. Additionally, mass plantations with a single tree species create "green deserts" with less diverse birdlife.While tree planting is generally beneficial for forest-dwelling species, large-scale afforestation in the wrong environment causes severe declines in specific bird communities.

Planting trees impacts bird populations negatively when it happens in natural, non-forest ecosystems like grasslands or agricultural wetlands. Tree-planting displaces open-habitat specialists (e.g., larks, pipits) because trees fragment their habitats and provide perches for predators. Additionally, mass plantations with a single tree species create "green deserts" with less diverse birdlife.

While tree planting is generally beneficial for forest-dwelling species, large-scale afforestation in the wrong environment causes severe declines in specific bird communities.

Habitat Displacement:-

 Research in Savanna Ecosystems shows that planting trees in natural savannas leads to a drastic reduction in savanna-specialist birds, forcing them out in favor of woodland species. 

Predator Exposure:-

 In agricultural and grassland landscapes, adding rows of trees (shelterbelts) fragments the wide-open spaces these birds need, while giving predators convenient branches from which to hunt. 

Decreased Diversity:-

 A study on Farmland Wetlands revealed that planting windbreaks cut the abundance of grassland and wetland birds drastically. Similarly, replacing native grasslands with commercial monoculture tree plantations results in 17% to 61% fewer bird species compared to native forests.

 MJF Lion ER YK Sharma