Demonstration of acid phosphatase activity in the proventriculus of common weaver bird, Ploceus philippinus and whitebreasted kingfisher, Halcyon smyrnensis.

Acid phosphatase activity was histochemically localized in the proventriculus of two birds namely Ploceus philippinus and Halcyon smyrnensis. It was found that acid phosphatase-rich lysosomal activity appears to be relatively better developed in the proventriculus of piscivorous form, H. smyrnensis than that of granivorous form. P. philippinus. Simultaneously, a possible correlationship between the variable lysosomal activity and specific food diets of the birds has been discussed.