Forty African giant rats (AGRs), (Cricetomys gambianus-Waterhouse) were used for morphometric, morphologic and histologic. The rats were sacrificed according to the method of Adeyemo and Oke (1990) and the different segments of the small intestine (duodenum, jejunum and ileum) were weighed, measured and photographs taken. Transverse sections of the different segments of the small intestine were stained with Haematoxylin and Eosin for normal histological studies. The small intestine was observed to have a mean weight and length of 17.19 ± 0.30g and109.17 ± 28.68cmrespectively. The small intestine had three segments (duodenum, jejunum and ileum),their mean weight and length were 5.00 ± 0.11g, 9.46 ± 0.20 g, 2.65 ± 0.07 g and 20.15 ± 0.93 cm, 72.26 ± 2.39 cm and 16.25 ± 0.37 cm, respectively. The duodenum had prominent Brunner’s glands which were seen in the submucosa. Numerous villi which were finger-like were seen in the jejunum. Intestinal glands and Payer’s patches were seen in the ileum.
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