Even as authorities have started clearing trees at Aarey Colony to make way for the Metro 3 car depot, wildlife lovers and birders have expressed fear that the tree-cutting activity, which started in the night, could have a negative impact on the birds and their nests.

Wildlife conservationist and birder Anand Pendharkar from NGO SPROUTS said, "Tree roosting and hole-nesting birds will be displaced from their homes and will most likely fall prey to wild predators, such as leopards, pythons, wild pigs, jackals and feral predators. They may even get run over by vehicles. If the trees are home to a heronry [a breeding colony of herons], thousands of birds can be displaced at one go." He also expressed fear that migratory birds, which travel thousands of kilometres, will be deprived of a home when they visit Aarey next.

According to birder Avinash Bhagat, the trees at Aarey serve a different purpose for resident and migratory birds. "While the resident birds use the trees for roosting and nesting in addition to feeding, the migratory birds use the trees for a stopover. A majority of the water birds of Tulsi, Vihar and Powai lakes will be rendered homeless. The structures that will come up in the future will affect both types of birds."