Hey all. I have two fire bellies (bombina orientalis), one yellow-ish, and I am pretty sure a female, and the other dark green (their backs). The second one seems to change color a lot. He also always mounts the female, who is smaller than him, and does this eagerly for the past few weeks. The always sends a release call when he mounts, unless i am mistaken and they are both males. I know that they both can call.