Sometimes while in flight they look down and think they see water, and land on wet pavement. Grebes have to run and flap on the surface of water to take off, so if they land on pavement they are stranded. When they land on the ground they loose the waterproofing in their feathers, which clog up with dirt, and oils from the road. The grebes, like birds in an oil spill, have to be washed with a special detergent, then rinsed so they can fluff and dry. And goldfish beware.
Grebes are live fish eaters, and are fed live goldfish while they recover.
Each species of bird requires different food and housing. It's hard emotionally. It's difficult when you loose some, or have to put some to sleep. Once the bird or animal has recovered they are returned in the area where they were found. Sometimes the person that found the creature will be invited along to the release back into the wild.