Zoo members pay an annual fee which entitles them to many benefits, including unlimited free admission to the zoo throughout the year during normal public opening times, free admission to other leading zoos, discount in the zoo gift shops, restaurants and cafes, a quarterly full colour zoo magazine and a special invitation to members' days throughout the year.

Sharon Leeson, head of marketing and development, said: "With the recent good weather the membership figures are soaring. April was a good month for new memberships with over 1,700 people deciding to join for the first time and over 1,600 people renewing their membership with us.

"Membership offers great value for money for anyone who is likely to visit the zoo more than three or four times a year."

The members' days were introduced last year, and the first one of 2008 was held on Sunday. Over 1,500 members visited the zoo and took part in the special programme of activities including Meet the Keepers, talks from zoo staff, nursery and garden tours, an opportunity to feed the free-flying birds in the Tropical Realm and a junior craft workshop. Two further members' days are due to be held on July 8 and November 8.

Members pay an annual subscription each year; £60 for an adult and £30 for a child, which entitles them to many benefits; including unlimited free admission to the zoo.

For more information on becoming a zoo member call Chester Zoo on 01244 380280.