Because that's what my father told me it was later 
If he was wrong, of course, that brings us back to Tim May's observations about Motty having last been on display in the 1980's or thereabouts - though does not resolve why I recall seeing two (both apparently African) elephant calves on display, then just the one African calf the next time I visited.
If he was wrong, of course, that brings us back to Tim May's observations about Motty having last been on display in the 1980's or thereabouts - though does not resolve why I recall seeing two (both apparently African) elephant calves on display, then just the one African calf the next time I visited.