Experts in Florida are still struggling to understand why critically endangered smalltooth sawfish are swimming in circles and beaching themselves, despite testing hundreds of water samples and analyzing fish tissue.
"The cause, or causes, of the abnormal behavior and mortality of fish in the Florida Keys (prominently including sawfish) remain unknown," Theresa Cody, associate research scientist at Florida Fish and Wildlife Conservation Commission (FWC) Fish and Wildlife Research Institute, told Live Science in an email.
