By Tobias Carroll Four years ago, a group of scientists discovered something interesting about amphibians — they can often viably reproduce across species lines in ways other types of animals cannot. There are a host of reasons for this, and, in the case of certain species of frogs, which parent comes from which species plays a massive role. But it’s one thing to breed frogs or toads as part of an experiment and another thing to see see that same principle play out in the wild. As it turns out, plenty of amphibians do end up having, shall we say, relations across inter-species lines in the wil…