Data from: What makes a fang? phylogenetic and ecological controls on tooth evolution in rear-fanged snakes

Erin Westeen, Andrew Durso, Michael Grundler, Daniel Rabosky & Alison Davis Rabosky
Background: Fangs are a putative key innovation that revolutionized prey capture and feeding in snakes, and – along with their associated venom phenotypes – have made snakes perhaps the most medically-significant vertebrate animals. Several snake clades are known for their forward-positioned fangs, and these clades (Elapidae; Viperidae) contain the majority of snakes that are traditionally considered venomous. However, many other snakes are "rear-fanged": they possess potentially venom-delivering teeth situated at the rear end of the...
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These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?