The popular attraction is providing free tickets for mums on March 18 and 19 to mark a "baby boom" of rare species.
Two Sumatran tiger twins were born recently at the zoo, as well as a Coquerel’s sifaka lemur.
A spokesman said: "Mum's go free this Mother's Day weekend.
"There's been a baby boom of rare and endangered species at our zoo! To celebrate, we're offering FREE entry to mums, step-mums, grans and nans (when accompanied by a paying adult/child, or with valid membership) across Mother's Day weekend.
"Mums don’t need to pre-book, just turn up on the day with your pre- paid adult or child.
"Explore the zoo, connect with nature and discover more about our incredible efforts to prevent extinction."
To find out more and book, visit chesterzoo.org/