Zurich Zoo - any reduced cost days

I'm looking to go to the zurich zoo

I'm wondering if there is a REDUCED ticket price day/weekend/holiday.....

I've read some posts from about a year + ago and I'm not confident they are "active" anymore.

Thanks for the help

I don't have a specific date in mind, I just want to make sure I go in the next year.

SBB have 20% off

Not sure of their T&Cs

Entering in the last 90 minutes brings a 40% discount on all single tickets.
And there is a slightly reduced fee on Mondays.
https://www.zoo.ch/en/plan-your-visit/tickets

Some companies (SBB, EWZ, ZKB, …) arranged discounts:
https://www.zoo.ch/en/node/1270