The current study was designed to determine the concentrations of toxic metals (Ni, Pb and Cr) in feathers of birds collected from four regions of NE Pakistan. Feather samples of birds (House Crow, Common Myna and House Sparrow) were collected from different areas. Atomic absorption spectrophotometer was used to determine the concentration of metals in feathers. Analysis of the data revealed that concentrations of Pb and Cr were significantly different (p < 0.05) among bird species, whereas no difference (p > 0.05) was detected among bird species (house crow, common myna and house sparrow) for Ni. A significant difference was found for the concentration of Pb and Ni in all the four studied regions. Whereas, non-significant difference was found in all the studied regions for the concentrating of Cr. It was revealed that there is significant rising concentration of metals (Pb, Cr) in feathers of birds in Azad Kashmir.

目前的研究旨在确定从巴基斯坦东北部四个地区收集的鸟类羽毛中有毒金属（镍、铅和铬）的浓度。从不同地区采集鸟类（家鸦、八哥和家麻雀）的羽毛样本。使用原子吸收分光光度计测定羽毛中金属的浓度。数据分析表明，不同 鸟类中Pb 和 Cr 的浓度存在显着差异（ p < 0.05），而 Ni 则在鸟类（家鸦、八哥和麻雀）之间没有检测到差异（ p > 0.05）。在所有四个研究区域中，Pb 和 Ni 的浓度均存在显着差异。然而，在所有研究区域中 Cr 的富集均未发现显着差异。据透露，自由克什米尔鸟类羽毛中的金属（铅、铬）浓度显着上升。