BROWN HAIRSTREAK SURVEY
The brown hairstreak butterfly (Thecla betulae) is severely declining in the UK with a 49% reduction in occurrence between 1976 and 2014 (Fox et al. 2015).
The brown hairstreak butterfly (Thecla betulae) is severely declining in the UK with a 49% reduction in occurrence between 1976 and 2014 (Fox et al. 2015).