Manatees are irresistible. There's something about their rotund shape and bovine nature that make them just too adorable not to love. However, we humans aren't expressing this affinity so well. Listed as endangered, manatees are subject to some serious threats, including boat strikes and climate change. Conservation photographer Rebecca Jackrel visited Florida in February to spend time with these gentle giants. Here are some of her fantastic photos documenting manatees and their plight.