Ups and downs for UK's nocturnal species

Barn owl
67% increase in their range since the late 1980s according to the British Trust for Ornithology's (BTO) recently published Bird Atlas 2007-11
Experts are still investigating why populations have been increasing but point to the provision of nest boxes and environmental schemes on farms as possible factors.
Paul Stancliffe from the BTO describes 2013 as a "lean year" for the birds due to a cold start but remains hopeful for next year's breeding season.
Nightjars
Populations have increased by 128% since 1981.
Restoration of heathland habitats has helped the birds to recover from dramatic declines in the late 20th Century.read more