How biomagnification affects the top carnivores ?

Explanation

Biomagnification refers to an increase in the concentration to a toxicant at successive trophic levels. These toxic substances ( such as mercury and DDT) get accumulated in the organism.s body and do not get excreted or metabolised and are passed on to the next trophic level.
Thus its concertration is increased at each successive trophic levels reaching to dangerous levels in the top carnivores.
The high concentration of DDT interferes with calcium metabolism in birds and causes thinning of egg shells and their premature breaking, ultimately causing decline in bird populations.