Welcome to Wild In Britain, an occasional and irregular photo journal of my encounters with all types of wildlife in the British Isles. All species featured on the site are wild, and all photographs are the copyright of Ben Locke. For prints and licensing click here. Please also take a look at my main site BenLocke.co.uk
The female adder usually reproduces once every two years, returning to the site of hibernation towards the end of August or early September to give birth. The adder is viviparous, giving birth to between 3 and 18 live young which are initially encased in a membrane. After giving birth the female must feed intensively in order to build up sufficient reserves for hibernation (3). The young adders do not feed until the following year, but live off the yolk sac and fat reserves that they are born with. The adder reaches sexual maturity at three to four years of age.