O femela de rechin din specia rechinului de Atlantic cu coada neagra nu a aratat nici un semn de graviditate deoarece intreaga sa viata si-a petrecut-o intr-un acvariu din Virgina, acvariu in care nu fusese introdus nici un rechin mascul. Cu atat mai mare a fost mirarea cercetatorilor cand, la autopsia femelei de rechin, au descoperit ca aceasta urma sa dea nastere unui pui!
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