Togo, Sgt Pepper was at the top of the charts in early 1968 though made the previous year.
There's no obvious answer. None of the top albums that year has a name anything like a bird. If you're prepared to call Diana Ross a bird, she and the Supremes are the only females on the list. If you think a single track on an album can quality as being on top of the album charts (the way each member of a relay team can get a gold medal), then Blackbird - never released as a single, as far as I know. The Byrds and Joni Mitchell weren't on top of any charts I can find.