Expanding Tropical Forest Spells Disaster for Conservation (1 of 3) (video) North Carolina State University Share Print E-Mail Loading video... Caption Drone footage showing how forest lands encroach tropical savannas. Plants and ants native to tropical savannas disappear when forests encroach. Credit William Hoffmann, NC State University Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.