(Portland, OR) -- The Oregon Zoo has slashed ticket prices in half this week. Through November 8th, admission is just 13 dollars per person. The zoo moved to fall hours on Sunday, and is open daily from 9:30 a.m. to 3:30 p.m. You need to buy tickets online in advance to reserve a time. There are activities through the day to learn about bats, condors, chimpanzees and sea otters.