Typically an id is required for validation of season passes, which are per-individual. I believe normal tickets require no id, but you will be encouraged to get a season pass. I find it to be worth the extra cost, if you anticipate being at the zoo multiple days within a year.
No
Yes for proof of CA residency.
If you buy your tickets there they ask for it at the ticket counter
Not if you buy a ticket. You need id if you are using a member's pass.
No u need a ticket!
No they have kiosk machines outside the zoo to buy tickets
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