She said: “This is a once-in-a-generation chance to witness nature’s comeback into your own backyard.”
The council has teamed up with London Wildlife Trust to handle their reintroduction, and said the two green spaces were “exceptional sites” that could support the species’ return.
The two bodies have secured funding from City Hall, the government and corporate sponsors to pay for the joint project.
A purpose-built aviary with grassland areas at Eastbrookend Country Park will house the reintroduced white storks.
The resulting chicks born there will eventually be released to help establish a new breeding population in the area.
The beavers will be released into a lakeside enclosure with 16 acres of open water and several small islands at The Chase in March 2027.
It follows the successful reintroduction of beavers in an enclosure in Paradise Fields in Greenford, west London, in October 2023.
Labour councillor Ashraf said the funding would also pay for a new species recovery officer who could run nature walks, school visits and a voluntary programme.
She said the project would come at “no cost to the local taxpayer”, according to the Local Democracy Reporting Service.