Experts have noted that with the increase of malaria, sparrows are now flying farther afield to search for leaves of a tree known for its high concentrations of naturally occurring quinine, which is an antimalarial medicine.
Eksperdid on pannud tähele, et malaaria levides on varblased hakanud lendama kaugemale kui tavaliselt, et otsida lehti puult, mis sisaldab hulgaliselt looduslikku kiniini. See on malaariaravim.