The species of birds confirmed as poisoned and included in the incidents are red kite, buzzard, golden eagle, tawny owl, and peregrine falcon.

BBC: Red Kite

Peregrine falcon numbers declined during the 19th and 20th Centuries due to illegal shooting and use of certain pesticides on farms.

BBC: Norwich Cathedral peregrine falcon lays second egg

Mobile phone customers have complained about service not being resumed in parts of Southampton after a peregrine falcon nested by a faulty transmitter.

BBC: Vodafone blasted over response to falcon nest

The chicks' parents are among some 20 peregrine falcon pairs that live in New York City, favoring bridges and tall buildings where they can easily spot their prey.

WSJ: 4 falcon chicks living on NY-NJ bridge are banded

The Ouse Washes includes a large floodplain which is looked after by the Royal Society for the Protection of Birds and provides a habitat for the Bewick's swan and whooper swan and wintering birds of prey, including the hen harrier, merlin, peregrine falcon and short-eared owl.

BBC: Work on new flood defences near Ouse Washes starts