Table 4.

Pearson's correlation coefficients between different combinations of metals in all three species of birds

Species	Metal combinations	Correlation coefficient	p-value
Overall	Pb–Ni	0.598	0.000
	Pb–Cr	0.214	0.026
	Ni–Cr	0.273	0.008
Crow	Pb–Ni	0.617	0.000
	Pb–Cr	0.469	0.004
	Ni–Cr	0.642	0.000
Myna	Pb–Ni	0.586	0.000
	Pb–Cr	− 0.060	0.728
	Ni–Cr	− 0.019	0.912
Sparrow	Pb–Ni	0.720	0.000
	Pb–Cr	0.589	0.000
	Ni–Cr	0.313	0.063