Well, cloning is hard. As in really actually hard to get a result. Even harder to modify the organism in the process. Hybridizing is even harder with most dista

Well, cloning is hard. As in really actually hard to get a result. Even harder to modify the organism in the process. Hybridizing is even harder with most distantly related species. Much was not understood in 1920s which is why they would fail. A reminder: it was almost a century ago.