So I was just wondering how this is possible in the first place. For example, I've seen pictures on the internets of (what supposedly are) leucomelas X tinctorius hybrids. But what I don't understand is how the frogs are attracted to each other in the first place. A tinc call is a low buzz, and a leuc call is a high trill; and from what I understand darts attract mates with their calls. So how does this happen?