My husband and I adopted Sam, a Quaker parrot, when he was 3 years old. His previous owner, who’d grown too ill to keep Sam, had treated him well and taught him a few phrases. Sam’s limited repertoire then -- and now -- includes laughter, “ma,” “hello” and “yum yum.” While Sam is not terribly fluent, he has inadvertently become an ESL -- English as a Second Language -- instructor. Sam fit into our household immediately, often flying on top of the parakeets’ cage. One of the parakeets, Gordie,