Editing Predation (section)

===Venom===
{{further|Venom|Evolution of snake venom}}

Many smaller predators such as the [[box jellyfish]] use [[venom]] to subdue their prey,<ref>{{cite book |title=Invertebrate Zoology, 7th edition |last1=Ruppert |first1=Edward E. |last2=Fox |first2=Richard, S. |last3=Barnes |first3=Robert D. |year=2004 |publisher=Cengage Learning |isbn=978-81-315-0104-7 |pages=153–154 }}</ref> and venom can also aid in digestion (as is the case for [[rattlesnake]]s and some [[spider]]s).<ref>{{cite book |author=Cetaruk, Edward W. |chapter=Rattlesnakes and Other Crotalids |editor=Brent, Jeffrey |title=Critical care toxicology: diagnosis and management of the critically poisoned patient |publisher=Elsevier Health Sciences |year=2005 |isbn=978-0-8151-4387-1 |page=1075 |chapter-url=https://books.google.com/books?id=WuA4LsWXXWEC&pg=PA1075}}</ref><ref name="Barceloux2008">{{cite book |last=Barceloux |first=Donald G. |title=Medical Toxicology of Natural Substances: Foods, Fungi, Medicinal Herbs, Plants, and Venomous Animals |url=https://books.google.com/books?id=CpqzhHc072AC&pg=PA1028 |year=2008 |publisher=Wiley |isbn=978-0-470-33557-4 |page=1028}}</ref> The [[marbled sea snake]] that has adapted to egg predation has atrophied venom glands, and the gene for its three finger toxin contains a [[mutation]] (the deletion of two [[nucleotide]]s) that inactives it. These changes are explained by the fact that its prey does not need to be subdued.<ref name="Li Fry Kini 2005 pp. 81–89">{{cite journal |last1=Li |first1=Min |last2=Fry |first2=B.G. |last3=Kini |first3=R. Manjunatha |title=Eggs-Only Diet: Its Implications for the Toxin Profile Changes and Ecology of the Marbled Sea Snake (Aipysurus eydouxii) |journal=Journal of Molecular Evolution |volume=60 |issue=1 |year=2005 |doi=10.1007/s00239-004-0138-0 |pmid=15696370 |pages=81–89 |bibcode=2005JMolE..60...81L| s2cid=17572816 }}</ref>