Redbutler has bird ( not specific bird ) first time in his design ...yes I admit it. But you ask specific bird (eagle) . After that he change his bird to eagle, and than he claimed all kind of bird including eagle, nobody could use the bird. So the problem is Redbutler think that eagle is the same with bird and you think that eagle is not the same with bird, because so many kind of birds.
Although many other design has different execution, Rudbutler can't except that