Manatee (video) Smithsonian Tropical Research Institute Share Print E-Mail Loading video... Caption An endangered Antillean manatee, grazes in the murky waters of the San San Pond Sak wetlands on Panama's Caribbean coast. Researchers at the Smithsonian Tropical Research Institute used sonar data to estimate manatee populations. Credit Ana Endara, STRI Usage Restrictions Credit: STRI 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.