Hi,
Below are some selected short videos that you can find on Arkive.org (together with pictures).
Vipera berus
http://www.arkive.org/adder/vipera-berus/video-09d.html
http://www.arkive.org/adder/vipera-berus/video-11.html
http://www.arkive.org/adder/vipera-berus/video-09b.html
Vipera ursinii
http://www.arkive.org/meadow-viper/vipe ... eo-00.html
Cerastes gasperettii
http://www.arkive.org/arabian-horned-vi ... -ga00.html
http://www.arkive.org/arabian-horned-vi ... -ga08.html
http://www.arkive.org/arabian-horned-vi ... -ga11.html
Natrix natrix
http://www.arkive.org/grass-snake/natri ... o-09b.html
Enjoy,
Guillaume