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Overall winner: Red night by Roberto García Roa (University of Valencia), taken in Madagascar
A Malagasy tree boa perches in a tree.
The Malagasy tree boa (Sanzinia madagascariensis) is a non-venomous snake species endemic to Madagascar.
Large individuals have become difficult to find in some areas surrounding human settlements.
Fires produced by humans and poaching are only some of the threats faced by the snakes.
Photograph: Roberto García Roa/2019 British Ecological Society photography competition