As a treat for all moms on Mother’s Day, mothers may enjoy free admission Sunday to the Greenville Zoo. The only proviso is that mom must be accompanied by one or more children who pay full-price admission. For children, 3 to 15 the Greenville Zoo admission is $5.50. Tomorrow the zoo pays tribute to its resident orangutan mother, Chelsea. A special event takes place from 9 to 2 tomorrow to pay tribute to the resident orangutan mother. It’s an event to create awareness of the large numbers of orangutan mothers killed in Indonesia as the result of de-forestation practices and high consumer demand for palm oil. Zoo volunteers and education staff will share information about orangutans and what the public can to do help. For more information about the Greenville Zoo, visit www.greenvillezoo.com.