If you’ve just found a dead animal, you need to temporarily preserve it until it’s in my possession to stop it decomposing as soon as possible. To do this, wrap the specimen in clingfilm/tissue/bags, label it and stick it in the freezer (not the fridge!).
It’s very important when you find a deceased specimen, to make a note of where, when and how you found it. This is a legal requirement, even more so with CITES listed species such as birds of prey.