I spent the first years of my life in Sudan where my father worked for the Sudan railways. I was proud to have a Daddy whose railway network stretched, over hundreds of miles, from the borders of Egypt to the savannahs and the great green swamps of the southern Nile. One of my first childhood memories is from 1937 when, at the ripe age of two, I respectfully fed my Mickey Mouse handkerchief to the resident hippopotamus in the Khartoum zoo.
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Brown et al. (2024) studied this question.
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