Fabio Pupin / Four-lined snake, (Elaphe quatuorlineata), juvenile coiled on Downy oak (Quercus pubescens) trunk, Croatia, April . Non-ex.

Fabio Pupin / European ratsnake, (Zamenis situla), resting on tree trunk, Croatia, April . Non-ex.

Fabio Pupin / European ratsnake, (Zamenis situla), resting on tree trunk, Croatia, April . Non-ex.

Fabio Pupin / Four-lined snake, (Elaphe quatuorlineata), basking in habitat, Croatia, April . Non-ex.

Fabio Pupin / Four-lined snake, (Elaphe quatuorlineata), juvenile coiled on Downy oak (Quercus pubescens) trunk, Croatia, April . Non-ex.

David Pattyn / Aesculapian snake (Zamenis longissimus), Kresna gorge, South West Bulgaria, April

Chris Mattison / Aesculapian snake (Zamenis longissimus) laying an egg. Captive, occurs in South Europe.

Chris Mattison / Aesculapian snake (Zamenis longissimus) eggs. Captive, occurs in South Europe.

MYN / Paul van Hoof / Aesculapian snake (Zamenis longissimus) juvenile, Greece, June. Meetyourneighbours.net project.

Daniel Heuclin / Leopard snake (Zamenis situla) captive, occurs in Eurasia.

Martin Gabriel / Aesculapian snake (Zamenis longissimus) melanistic form, Krk Island, Croatia, June.

Rod Williams / Vietnamese long-nosed snake (Rhynchophis boulengeri) captive, native to Northern Vietnam and Southern China.