14:00, 17 NOV 2015
UPDATED 14:17, 17 NOV 2015
BY JULIAN HUGHES
Provisional results of the latest nest survey last week find the birds numbers were down 12% since 2002
Peregrines are a flagship success for bird conservation.
Numbers crashed in the 1950s, principally because organochlorine pesticides in their food chain resulted in thinner eggshells and thus many nests failed.
A pesticide ban and increased nest protection helped Peregrine numbers to increase, but even by the early 1970s, there were just a handful of pairs on Anglesey and none at all nested in northeast Wales.
Over the next 40 years, they spread along sea cliffs and started to nest on built structures, such as Wrexham police station.
Last week the provisional results of the latest nest survey were published, finding Peregrine numbers were down 12% in Wales since 2002, to fewer than 250 pairs - reduced food supply is thought to be the main driver of the change.
High winds have pushed seabirds inshore: Little Gulls were off Bardsey and the Glaslyn estuary, a late Leach’s Petrel was at Criccieth and a Sooty Shearwater off Bardsey.
Two Great Northern Divers sought shelter in Holyhead Bay, nine were off Porth Ysgaden and another two off the Little Orme. Whooper Swans at RSPB Conwy and on Llanrwstfloodwater and a Common Scoter on Abergele’s Pentre Mawr lake were all unusual.
A Scaup remains on Parc Eirias boating lake, not deterred by last week’s fireworks, and the Great Grey Shrike continues its stay at Llyn Du near Porthmadog.