Around here in general is the saying "if it lives, it lives......." the goslings often die because they´re left in the fields for the parents to care for, and of course, they often don´t get everything they need nutritionally... of course, when it´s not their native homeland, we have to compensate......that´s why I think many goslings die. My friends that I got my first 3 from, in their ignorance, fed all their goslings really well! They bought chick crumb for their chicks, so the goslings ate it along with them.
Mostly it´s dogs that get dumped because there´s no-where to take them (only exists in the centre of São Paulo) and the vets won´t put down any unwanted dog, so they end up being dumped out in the countryside lanes, and either some poor person feels sorry for yet another dog and starts to feed it, or someone puts out poison, or it´ll starve to death. We´ve seen that, it´s very hard.