Head sizes....
https://academic.oup.com/biolinnean/article/116/3/626/2440520
Snail consumption...
https://www.int-res.com/articles/esr2014/24/n024p115.pdf
https://academic.oup.com/biolinnean/article/116/3/626/2440520
Snail consumption...
https://www.int-res.com/articles/esr2014/24/n024p115.pdf
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