I’m addicted to the live stream of Melbourne’s peregrine falcons. But to really appreciate them you have to see them in flight | Debbie Lustig

Melbourne 's peregrine falcons are a cultural phenomenon.

For decades , pairs of falcons have raised their chicks from an eyrie 150 metres above the street in the office block at 367 Collins Street.

Since a live stream was established in 2017 , cameras have beamed their every move to thousands of fans, for 12 weeks each year during breeding season .

On Thursday , two of them flew off the ledge about 6am , a second appeared to slip off; both are assumed still alive.