Here is a selection of pictures I took during fieldwork in the Netherlands. They show some of last year’s observations. All pictures we’re taken in the Dutch province of Friesland.
Vipera berus, male
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/07-03-2015%20094%201_zpsdehokewx.jpg)
Vipera berus, female
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/27-6-2015%20024%201_zpsltlcg0bt.jpg)
Vipera berus, female
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/19-6-2015%20036%201_zps8wo6xigh.jpg)
Vipera berus, mating behaviour
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/30-04-2015%20260%201_zpsczuuaiaz.jpg)
Vipera berus, juvenile
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/11-09-2015%20143%201_zpseofybh85.jpg)
Vipera berus, stillborn/deformed.
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/11-09-2015%20097%201_zpsuj1vat0n.jpg)
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/11-09-2015%20074%201_zpsvertjtrm.jpg)
Vipera berus, female suffering from the effects of dystocia (retention of follicles)
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/13-10-2015%20021%201_zpsqlvt9f0e.jpg)
Vipera berus, same female, more than 6 weeks later.....
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/dood_zpsqzhgfpuc.jpg)
At the beginning of March 2015 last year some pyromaniac thought it would be interesting to start a fire in one of the areas where I carry out fieldwork. Around 68 acres of heathland was burned. Last year I have been monitorting the effects of this fire on the population of adders that live in this area and I will continue to do so next year. The pictures below show some adders after leaving their hibernaculum, three days after the fire took place.
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/16-03-2015%20058%202_zpsvuaerzol.jpg)
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/17-03-2015%20114%201_zps4bbhea46.jpg)
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/17-03-2015%20108%201_zps8v7qocfv.jpg)
Zootoca vivipara
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/17-03-2015%20167%201_zpsbbuot0lk.jpg)
Zootoca vivipara, melanistic
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/11-6-2015%20021%201_zpsvimkeuh6.jpg)
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/11-6-2015%20014%201_zpsuubi9gj0.jpg)
Coronella austriaca
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/30-04-2015%20182%201_zpsdarfmcq2.jpg)
Coronella austriaca, juvenile
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/11-09-2015%20183%201_zpsoaikteyw.jpg)
Natrix natrix, male
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/17-04-2015%20015%201_zpsd0bmlfs8.jpg)
Natrix natrix eggs, uncovered by (probably) a badger (Meles meles).
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/25-09-2015%20054%201_zpsd9cvb7ue.jpg)
Anguis fragilis, a pretty rare sight here...
![Image](http://i1325.photobucket.com/albums/u630/waaromzomoeilijk/11-04-2015%20122%201_zps0stpq5n2.jpg)
Thanks for watching,
Jelmer