No surprise to me after handling Roundup which eats the skin. When the herbicides are put on after harvest, the birds are accustomed to feeding on the grain twice a day and swallow Roundup treated seeds. No doubt it eats their digestive system the same as your hands if you get it on you. This and other reasons are why no-till, no-weed farming has got to go.
Ummmm Roundup is an Herbicide not a Pesticide, and Herbicides are usually put on pre-planting or early on growing season. This article has to do with pesticides, not weed control.