Why do you charge a lump sum if i bring my Terrapin/Turtle in and it is ill or injured?

If you are bringing your terrapin/turtle into us and if it is ill or injured we will ask that you pay a contribution to any treatment that it needs. It is a one off fee that helps us to be able to care and treat appropriately, as we have so many terrapins/turtles in our care. We could not continue to look after them otherwise.