Perils of ingesting harmful prey by advanced snakes

Area of Science:

• Herpetology
• Zoology
• Ecology

Background:

• Advanced snakes (Alethinophidia) possess specialized head morphology for ingesting large or dangerous prey.
• Natural history notes document instances of snakes being injured or killed during feeding.
• Previous understanding of feeding-related mortality in snakes is limited to anecdotal reports.

Purpose of the Study:

• To conduct the first extensive review of snake mortality incidents caused by injurious prey.
• To analyze the causes, prey types, and taxonomic distribution of these feeding-related mortalities.
• To propose a standardized framework for reporting future incidents.

Main Methods:

• Compiled data from 101 publications detailing 143 mortality cases.
• Included 15 new unpublished injurious feeding incidents from the USA, Austria, and Bulgaria.
• Categorized incidents into oversized prey, harmful prey, and predator errors.

Main Results:

• Documented mortality in at least 73 species across eight families and 45 genera.
• Oversized prey and harmful prey each accounted for 40.6% of incidents; predator errors for 18.9%.
• Reptile (33%) and fish (26%) prey caused higher mortality than mammals (16%).

Conclusions:

• Snake mortality during feeding is likely more common than previously assumed.
• Incidents occur across various snake taxa and life stages, with later feeding stages being more perilous.
• Findings have implications for understanding snake population dynamics in changing environments.