Imagine coming upon an abandoned Yoshi egg. It's getting cold and in serious danger in the wilderness, and there's no one to claim it. How would anda proceed?

For me, I'd proceed oleh taking it home, and warming that egg. When it hatches, I'll take care of it like it was my own (which, hypothetically speaking, it IS) until it grows big enough to care for itself. Then the hard part--I'll take it to its true home: Yoshi's Island. I'll bid a goodbye to it. But hopefully, I would still visit him every once in a while.