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Observations carried out on the development of feeding behaviours in Giraffe Giraffa camelopardalis calves at Brookfield Zoo, Chicago, gave the mean earliest ages observed as lower than the mean of those previously published for Giraffes in the wild and in captivity. The mean age of ten calves for ingestion of food was 8–9 days, drinking water 7-4 days and rumination 28-8 days.