"Bosco" and co. (Kodiak bears)

Woodland Park Zoo at one point had 7 species of bear simultaneously. The only bear species they never had to my knowledge is Spectacled Bear.

@Gilgamesh I'm fairly certain they never had Giant Pandas.

@Komodo Dragon

They did but only on loan. During the 1950s it was on it's way to Chicago I believe. SO it is true they never had a permanent Giant Panda exhibit they did have one temporarily in transit. Also Koalas used to be in the children's zoo in the late 1980s despite not being a bear.