A still taken from a video on YouTube at http://youtu.be/zSnJjr6Jy4Q.
Seen on this week's iSpot Exploring Nature session. For details see http://www.dorsetwalks.com
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I would think it's probably one of last year's babies. At 20cm it would pretty big (although not impossibly so) for one of this year's. It is a bit on the early side for young adders too (although again not impossible) but given the poor weather this summer I would think it would be unlikely that such a large baby would be born so early.
Agreed, but don't forget we had a warm dry spring before the wet set in. Adders were active in this wood as early as February this year.
February is fairly normal for adders to be active in a lot of areas, not sure about this specific site though. The most important factor in determining the size of the offspring is the amount of time the females are able to bask and feed whilst they are gravid.
Lat/Lng: 50.7266, -2.3879
OS grid ref: SY727919