Friday, August 2, 2013 at 8:40AM Certhia familiaris britinnica
Common resident. Three times recorded Skokholm: 26 July 1928, 8 Nov 1930, 12-23 July 1938
R.M.Lockley, G.C.S.Ingram, H.M.Salmon, 1949, The Birds of Pembrokeshire, The West Wales Field Society
Wednesday, July 4, 2012 at 12:36PM Field experience during the 1984-88 survey suggested an average density of five pairs per tetrad, from which a county total of 1,000 nests was calculated. The figure derived from the 1988-91 National Atlas was marginally lower. The BBS assessed there was a 21% decrease in Wales between 1994 and 2007, which if applicable to Pembrokeshire suggests a breeding population of a little less than 800 pairs at the end of the 2003-07 survey. Winter survival of Treecreepers decreases with an increase in wet weather. The trend towards wetter winters in Wales during the past fifteen years may well be at least part of the explanation for the reduced breeding population.
Graham Rees
Fieldwork 2003-07 (based on 490 tetrads)
Red = breeding confirmed = 64
Orange = breeding probable = 95
Yellow = breeding possible = 38
Total tetrads in which registered = 197 (40.2%)
Monday, December 26, 2011 at 2:31PM Breeding resident
A common resident according to Mathew (1894) and Lockley et al. (1949), the Treecreeper is still widely distributed in Pembrokeshire, wherever there are suitable trees. Census results suggest an average density of five pairs per occupied tetrad and thus a county total of about 1,000 pairs.
Severe winter weather sometimes causes a marked increase in mortality, particularly when ice glazes tree bark, but they seem to recover their numbers quickly in subsequent years.
They wander with tit flocks outside the breeding season and have reached most of the offshore islands, usually being seen about the sea cliffs, rock outcrops and walls, but one seen on Grassholm on 17 June 1957 was clinging to the only wooden post on the island.
Fieldwork 1984-88 (based on 478 tetrads)
Red = breeding confirmed = 75
Orange = breeding probable = 64
Yellow = breeding possible = 72
Total tetrads in which registered = 211 (44.1%)
Sunday, November 13, 2011 at 6:17PM 
Red = breeding confirmed
Orange = breeding probable
Yellow = breeding possible
Sunday, October 9, 2011 at 10:29PM 
The BTO winter atlas showed that Treecreepers were present in the majority of 10km squares during the winters of 1981-82, 1982-82 and 1983-84.
The darker the colour, the higher the relative total count for each 10km square. The darkest blue represents over 6 birds seen in a day.
Winter distribution was similar to that of the breeding season.
Graham Rees
Saturday, December 18, 2010 at 9:00AM Species account from M Mathew, 1894, "The Birds of Pembrokeshire and its islands"
