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Guardian

Guardian

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Science

Aquarium surprised by ‘virgin birth’ of swell shark in all-female tank

Guardian
Summary
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67% Informative

Yoko, the swell shark pup, hatched on 3 January after an egg was spotted by the US aquarium’s animal husbandry team eight months ago .

The two female sharks present in the tank had not been in contact with a male for more than three years .

This suggests either a process called parthenogenesis, a rare form of asexual reproduction, or delayed fertilisation may have occurred.

VR Score

70

Informative language

72

Neutral language

20

Article tone

semi-formal

Language

English

Language complexity

52

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not offensive

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not hateful

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medium-lived

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