The peacock will have maximum concentration of harmful chemicals in its body as the accumulation of harmful chemicals which are non-biodegradable increases at every trophic level. This phenomenon of increase in concentration of harmful chemicals at every trophic level is called bio-magnification. Since peacock are placed at top of this food chain so it will have maximum concentration of the harmful chemicals in its body.
Biological Magnification is the process in which a harmful chemical enters the food chain and gets concentrated at each trophic level.