Humans don't have interconnected teeth for slicing, or a secondary set of jaws to clamp down on prey already in our mouths, however, the rest of our animal kingdom is full of strange and awesome adaptations.

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Sources:

http://www.antarctica.gov.au/about-antarctica/wildlife/animals/seals-and-sea-lions/crabeater-seals
http://www.pinnipeds.org/seal-information/species-information-pages/the-phocid-seals/crabeater-seal
http://www.iucnredlist.org/details/12246/0
http://www.climatecentral.org/news/climate-change-could-put-tiny-krill-at-risk-20641
http://www.smithsonianmag.com/science-nature/14-fun-facts-about-naked-mole-rats-28758269/
http://www.lpzoo.org/animal/naked-mole-rat
http://www.pnas.org/content/99/8/5692.short
http://mentalfloss.com/article/57124/14-facts-about-cookiecutter-shark
https://www.flmnh.ufl.edu/fish/discover/species-profiles/isistius-brasiliensis
http://www.elasmo-research.org/education/ecology/deepsea-cookiecutter.htm
http://phenomena.nationalgeographic.com/2013/01/23/what-bit-this-great-white-shark-a-cookie-cutter/
http://www.nature.com/nature/journal/v449/n7158/full/nature06062.html
http://www.nytimes.com/2007/09/11/science/11eel.html
http://www.lazoo.org/animals/mammals/babirusa/
https://www.stlzoo.org/animals/abouttheanimals/mammals/hoofedmammals/babirusa
http://scienceblogs.com/tetrapodzoology/2010/03/08/babirusa-impales-own-head/
https://blogs.scientificamerican.com/running-ponies/prehistoric-ghost-shark-helicoprions-spiral-toothed-jaw-explained/
http://rsbl.royalsocietypublishing.org/content/9/2/20130057
http://nmlc.org/2011/07/sea-turtles-part-3-leatherbacks-loggerheads-and-greens/

Images

http://www.thinkstockphotos.com/image/stock-photo-close-up-view-of-an-female-biting-her-lip/159289918
https://commons.wikimedia.org/wiki/File:Crabeater_Seal_in_Pl%C3%A9neau_Bay,_Antarctica.jpg
https://commons.wikimedia.org/wiki/File:Cr%C3%A2ne_de_Phoque_crabier.jpg
https://commons.wikimedia.org/wiki/File:Lobodon_carcinophaga_teeth.svg
https://commons.wikimedia.org/wiki/File:Naked_mole_rat.jpg
https://commons.wikimedia.org/wiki/File:Cookiecutter_shark_head.jpg
https://commons.wikimedia.org/wiki/File:Cookiecutter_shark_head2.jpg
https://commons.wikimedia.org/wiki/File:Cookiecutter_damage.jpg
https://commons.wikimedia.org/wiki/File:Isistius_brasiliensis_lower_teeth.jpg
https://commons.wikimedia.org/wiki/File:Gymnothorax_meleagris_Hawaii.jpg
https://commons.wikimedia.org/wiki/File:G.Javanicus8.jpg
https://commons.wikimedia.org/wiki/File:Pharyngeal_jaws_of_moray_eels.svg
https://commons.wikimedia.org/wiki/File:Hirscheber1a.jpg
https://commons.wikimedia.org/wiki/File:Babyrousa_celebensis_-_Crane.jpg
https://commons.wikimedia.org/wiki/File:The_wild_beasts_of_the_world_(Plate_31)_(8116043287).jpg
https://commons.wikimedia.org/wiki/File:Helicoprion_Bessonovi2.jpg
https://commons.wikimedia.org/wiki/File:Helicoprion_bessonovi1DB.jpg
https://commons.wikimedia.org/wiki/File:Leatherback_sea_turtle_Tinglar,_USVI_(5839996547).jpg
https://commons.wikimedia.org/wiki/File:Leatherback_turtle_oesophagus.jpg
http://www.thinkstockphotos.com/image/stock-illustration-illustration-of-naked-mole-rats-inside/102115590