Passholders at Colchester Zoo will be able to visit the attraction without booking as of Monday.
The attraction, in Maldon Road, has announced plans to help those with passes make the most of the zoo.
The move is on a trial basis for now, with the zoo having alreading tested out the plans open reopening earlier this year.
As of June 7 any passholders or those with complimentary/open dated tickets will not be required to book.
Anyone visited before Monday must still book a timed entry.
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A spokesman said: "From 7th June onwards, Zoo Passholders and those with existing complimentary/open dated tickets will no longer be required to book to visit Colchester Zoo!
"Those visiting us for the remaining days of May half term (3rd – 6th June) MUST still pre-book to help us manage capacity.
"Please be aware this is a trial only, further changes may be made as we review this and bookings may be reintroduced at any time.
"Should we reach our capacity, a one in-one out system will be put in place.
"Those who require paid tickets MUST still pre-book online in advance for their visit."
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