http://www.sciencemag.org/news/2019/12/how-ants-walking-backward-find-their-way-home

Spanish desert ants can find their way home while dragging food backward.

Every day, tiny, red insects called Spanish desert ants make several trips from their nest in search of food. When they find a small snack like a seed or crumb, they can hold it aloft in their tiny jaws and carry it home. But when they encounter a larger meal, say, a dead cricket or a piece of popcorn, they often have to drag it, walking backward, to get it to the nest.