From MinuteEarth.

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When a baby sand tiger shark hatches from its egg, it finds itself trapped inside its mom’s uterus, forced to eat its siblings, or be eaten. It’s super weird, but pitting your kids against each other can sometimes be a winning parental strategy.

LEARN MORE
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To learn more about this topic, start your googling with these keywords:
– Siblicide: the killing of a sibling or siblings, as a behavior pattern typical in various animal groups.

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CREDITS
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Cameron Duke | Script Writer, Narrator and Director
Lizah van der Aart | Storyboard Artist
Sarah Berman | Illustration, Video Editing and Animation
Nathaniel Schroeder | Music

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Lizah van der Aart • Sarah Berman • Cameron Duke
Arcadi Garcia i Rius • David Goldenberg • Melissa Hayes
Henry Reich • Ever Salazar • Leonardo Souza • Kate Yoshida

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REFERENCES
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Alcock, John. Animal Behavior : An Evolutionary Approach. 10th ed., Sunderland, Ma, Sinauer, Cop, 2013.

Chapman, Demian D., et al. “The Behavioural and Genetic Mating System of the Sand Tiger Shark, Carcharias Taurus , an Intrauterine Cannibal.” Biology Letters, vol. 9, no. 3, 23 June 2013, p. 20130003, https://doi.org/10.1098/rsbl.2013.0003

Das, Shreyasi. Siblicide in Black Eagles. 1 Jan. 2024, pp. 1–6, https://doi.org/10.1007/978-3-030-85493-5_2120-1

ROSENHEIM, JAY A., and DAVID HONGKHAM. “Clutch Size in an Obligately Siblicidal Parasitoid Wasp.” Animal Behaviour, vol. 51, no. 4, Apr. 1996, pp. 841–852, https://doi.org/10.1006/anbe.1996.0088

Walsh, Jeffrey A., et al. “A Descriptive Analysis of Siblicide: Examining Ten Years of Incidents Reported in the National Incident-Based Reporting System (NIBRS), 2013–2022.” Journal of Aggression, Maltreatment & Trauma, vol. 33, no. 12, 12 Nov. 2024, pp. 1458–1472, https://doi.org/10.1080/10926771.2024.2428796