Mumbai has seen around a 25% increase in the number of Flamingoes migrating to the area compared to last year, the lockdown is the likely cause.

As India remains under lockdown, flamingos are flocking to Mumbai, CNN reported. 
Rahul Khot, assistant director at the Bombay Natural History Society (BNHS), which monitors the flamingos, told CNN that flamingos typically migrate to Mumbai from September through May.
Take a look at the swarms of Flamingos across Mumbai.