Food Chain

Obtain 10 skin samples of the Strange Echidnas and bring them to Vincent Trickov at the Eastern Terminal.

Unfortunately, we don't have anyone with such expertise. We will have to figure this out on our own... Let's think.
If the droppings radiate the emission, it means that something's wrong with the food. Judging be the place where we've found them, we can assume that these are droppings of a carnivore. And carnivores feed on weaker animals. So... there must be something wrong with the prey. As far as I know, local predators prefer to hunt echidnas. So let's start with echidnas!
I think if we take a closer look at their skin, we may find something out. Please, bring me some ten samples. I am very curious about it!
Echidnas can be found to the East from here. They usually hide in the old sentry post and on uphill paths around it.

Let's hurry! It will be rather distressful if we all develop radiation sickness because of these droppings...

Erm... What is this? Is this skin? It looks really strange.
Something weird has happened to these echidnas. You say, they were behaving oddly? I see.
Look, the device has detected the very same radiation! Oh, I don't like it. Here is what we shall do...