“…Previous research has shown that pesticide accumulation levels are increasing in keratinous tissues as in other tissues of birds contending higher level dwellers of the food web (Hargrave et al, 1992;Corsoliniet al, 2006). Therefore, using keratinous tissue such as mammalian hair (Covaci and Schepens, 2001) and bird feathers (Jaspers et al, 2007;Abbasi et al, 2017;Arıkan et al, 2018b) as nondestructive biomonitoring methods (D'Havé et al, 2006) could be a more effective and widely accepted sampling technique for residue analysis, including OCPs. Besides, studies show that nondestructive biomonitoring methods (D'Havé et al, 2006) are a suitable, reliable, cost-effective, and expedient way to investigate and monitor OCPs in wildlife (Schramm, 2008).…”