Bloody Trees! Posted on June 17, 2014 by Smithsonian OFI in The OFI Blog SERC Intern Megan Palmer adds water to pig blood powder. Dejeanne Doublet is an intern at the Smithsonian Environmental Research Center (SERC). During her first days her mentor asked her to spray trees with pig’s blood. What a great thing to start with! Want to find out more? Look here.