Green and silver Quaker is positive and optimistic , they sound like . Some learn to speak , while others prefer to whistle . They may be young and to give a consistent , respectful treatment, if their socialization is love . Please note that these birds are in a few countries illegal because they are considered a threat to local agriculture. ( For information on where you live and restrictions , please contact your nearest agricultural or fish and game department department ) . However , Quaker 's worth, if you live in places where they are legal considerations .ling.. .