With sword-sized beaks, they glide effortlessly through the air, confidently showing off their ugly look.
Few people, even keen bird watchers, are attracted to their white and black jacket, but many wish they could be kicked out of their habitat.
The research published by Evans Okemwa, Obed Mainya Nyabaro, John Lusweti Kituy and Peter Kinyanjui cites high presence of lead, copper, cadmium and zinc in water, air, and on land.
They said the fact that River Nyakomisaro flows adjacent to the dumpsite, some lead was deposited at the banks when it was flooded, hence raising the concentrations in the river.