Children aged three to 12 must draw a picture of their favourite zoo animal. The creators of the best 60 pictures will win a place at the party on 12 June, and the chance to visit London Zoo for free. Pencils, crayons, watercolours or collage can be used, on paper no bigger than A4 size.
There will be different age-related categories so even the youngest artists have a chance to win. Entries should be accompanied by a letter stating the artist's name, age, address and telephone number/minicom.
Entries must be sent to the NDCS Press Office, 15 Dufferin Street, London EC1Y 8UR by 30 April. The winning pictures will be posted on the NDCS website at www.ndcs.org.uk.