A good understanding of how stress impacts an animal points towards the possibility of it occuring... There is good data out there that indicates that depending on the stress (repeated, one time, chronic) there are differences in how the animal can respond to it. Severe stress can not only increase corticosteroid levels and suppress the immune response, suppress reproductive output, but cause death. Stressors that are relatively the same day to day typically result in habituation to those stressors but stressors that can vary widely in intensity can cause death (see Health and Welfare of Captive Reptiles (Amazon.com: Health and Welfare of Captive Reptiles (9781402004032): Clifford Warwick, F.L. Frye, J.B. Murphy: Books) for the full explination). In the case mentioned above we have a froglet which was just shipped. Depending on the time out of water, we could have stress from metamorphosis(which already suppresses immune function) added to stress from shipping, stress from being placed into a new enclosure without any of the cues that allow for territorial recognition (visual, olfactory), and stress from microfaunal interactions. It isn't possible to decouple one stress from these situations and claim it couldn't have been x it must have been y as all of the stressors create a synergistic impact on the animal. It is also incorrect to attempt to equate this to a frog in the wild as the impacts are an apple and orange comparision (as an example, a frog in the wild while having stresses on it, those tend to be the same day to day, and are probably not causing the same increase of corticosteroids as the newly shipped froglet).Also had to do with losing a St Lamasi, heightened effect for the speices/morph of frog. A lot of this goes back to a guy that once said you can't ID frogs from a picture , bugs though not as variable can also be quite difficult to ID.