hi i have just purchased my 1st eva bird an african grey, he has a disability, his left leg seems to be disabled although he does struggle with this much he his reluctant to walk on it,and when he does he just seems to walk on the joint not so much the foot he is 18mths old and the last owner said he was born like this...when he walks he favours his right leg and only uses his left leg for climbing and holding nuts etc.. shud i get him to a vets or if he was born with it(no proof but have no reason to doubt the mans word) shud i just leave it as hes adapted to it?? any recomendations would be much appreciated...