A cikin 1898, 28 da aka rubuta a hukumance ma'aikatan jirgin kasa da ke gina Kenya-Uganda Railway sun dauki zakoki fiye da watanni tara a lokacin gina gada a kan Tsavo River a Kenya. The mafarauci wanda ya kashe zakoki ya rubuta wani littafi daki-daki da dabbobi' predatory hali; sun kasance ya fi girma fiye da al'ada da kuma rasa manes, da kuma daya ya yi kama da sha wahala daga hakora lalacewa. The infirmity ka'idar, ciki har da hakora lalacewa, ba favoured da dukan masu bincike. wani bincike na hakora da jaws na mutum-cin zaki a gidan kayan gargajiya tarin bada shawarar cewa rayuwa bayyana mutum lalacewa yayin da wasu rahotanni bayar da shawarar cewa mutum lalacewa, zai iya kai tsaye bayyana mutum lalacewa a cikin mutum-dominated yankunan ne mai yiwuwa ya faru a lokacin gina wani gada a kan Tsavo River a Kenya.
Gidan shakatawa na Selous a gundumar Rufiji da lardin Lindi kusa da iyakar Mozambique