I can perhaps offer a clue. Short lived might refer to the time they are kept?
I was involved in the rehab of dozens of common loons. At least in the cases I was involved in 100% of them were for one reason. They would land on areas that were not water. This was also very common for grebes. They have to run along a body of water before they can fly. No doubt they saw a mirage of water and land unable to do anything but flop. People would find them and bring them in. If kept overnight or for a day or two they would never eat dead fish.
After a check over I would take them to a local lake and plop them in the water. End of rehab