Comparative morphology of the glandular stomach and the gizzard of Large-billed and Carrion Crows

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  • HSU Chang Tuo
    United Graduate School of Department of Animal Science, Tokyo University of Agriculture and Technology Laboratory of Animal Function and Morphology, Utsunomiya University
  • TAKEDA Tsutomu
    Laboratory of Animal Function and Morphology, Utsunomiya University
  • AOYAMA Masato
    United Graduate School of Department of Animal Science, Tokyo University of Agriculture and Technology Laboratory of Animal Function and Morphology, Utsunomiya University
  • SUGITA Shoei
    United Graduate School of Department of Animal Science, Tokyo University of Agriculture and Technology Laboratory of Animal Function and Morphology, Utsunomiya University

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Other Title
  • ハシブトガラスとハシボソガラスの腺胃および筋胃の比較形態
  • ハシブトガラス ト ハシボソガラス ノ セン イ オヨビ キン イ ノ ヒカク ケイタイ

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Morphological and histological studies to analyse the characteristics of the glandular stomach and the gizzard of Large-billed Crows Corvus macrorhynchos and Carrion Crows C. corone were performed using light and electron microscopes, revealing several interspecific differences. The total area of the glandular stomach of C. macrorhynchos was larger than that of C. corone. Although there was no significant difference in the thickness of the glandular stomach wall between the two species, the glandular stomach gland layer in C. macrorhynchos was thicker than that of C. corone, whereas the muscle layer in C. corone was thicker than that of C. macrorhynchos. In addition C. corone had a thicker gizzard wall than that of C. macrorhynchos, and the muscle layer of the C. corone gizzard was proportionately much thicker than that of C. macrorhynchos. It has been reported that although both species are omnivores, C. macrorhynchos is slightly more carnivorous, whereas C. corone tends towards herbivory. Our results suggest that the interspecific differences in stomach histology and morphology might be the result of these dietary differences between C. macrorhynchos and C. corone.

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