Thousands of subscribers regularly tune into feather and poo-covered platforms for a sight of a peregrine nesting on its eggs, returning with a freshly caught prey for its chicks, or fledglings taking their tentative first flight.
It’s not for the squeamish.
“They are an apex predator who catch and kill live birds on the wing – as such the footage here may contain gory images,” warns Aylesbury Peregrines, where birds perch on the 12th floor of Buckinghamshire Council’s building.
Lesley Lithins, secretary at Cromer Parish Church in Norfolk, said its nest had become an enormous draw – with more than 1,000 people visiting a day in the summer.
Although the nest is out of sight, the Cromer Peregrine Project sets up by the adjacent museum every summer so people can take a closer look using monoculars.
“It’s wonderful to see these creatures so small and watching them grow,” she said.
“You get a bit obsessed – it’s a great feeling when you see them actually leaving the nest and flying, which is fabulous.”