A few days ago I found a robin near my house in a very poor condition. It seemed unable to fly, as it huddled on the pavement by the fence when I approached it, and made little attempt to hop away. It also seemed unable to close its beak. I attempted to shelter it with my hat and gave it some water and seeds (which it showed no interest in, presumably because it could not move its beak to eat or drink). Sadly, the robin was no longer alive when I checked on it the next day.
Naturally, I was very upset at the death of the robin I had tried to care for, so I wanted to ask why it might have been showing these symptoms, and what should I do if something like this happens again?