BIRDS at Mai Po reserve are being put up for ''adoption'' by the World Wide Fund for Nature in a bid to raise cash for the management of the reserve. The rare Dalmation Pelican and Mandarin Duck and the more common Pied Kingfisher and Little Egret are up for offer to anyone willing to pay between $499 and $1,299, depending on the species. Sponsors will receive a portfolio about their adopted species, a bird adoption certificate, a quarterly newsletter about the species, and two tickets to visit Mai Po. The World Wide Fund manages Mai Po and has been given more land by the Government to expand the reserve's area, but needs to raise money for its work which includes school visits, tending fishponds where the birds feed and supporting field research. Mai Po is one of the most important feeding stops for migrating birds on the south China coast and the winter visitors include the Dalmation Pelican and the Mandarin Duck, sponsorship for which is $1,299 and $999 respectively. Fewer than 1,400 pairs of Dalmation Pelicans and about 8,000 pairs of Mandarin Ducks exist. The more common Pied Kingfisher and Little Egret are regular stayers at Mai Po and their sponsorship costs $699 and $499 respectively.