The highest-dosed birds stayed a median of 3.5 days longer near the site where they were captured — possibly to recover and regain strength — than birds that weren’t dosed with the pesticide. Birds given the lower dose of pesticide (1.2 milligrams per kilogram of body mass) stuck around for a median of three days, and those that weren’t dosed with pesticides flew away after half a day. It does seem that after resting for a few days, the birds dosed with the pesticide were able to resume their migration, Eng says.