n.热带海牛，海牛(水生哺乳动物，栖息于美洲和非洲)

原形：manatee复数：manatees

The manatee is an aquatic mammal found in warm waters of the Americas.
海牛是一种生活在美洲温暖水域的水生哺乳动物。
Endangered species like the manatee need our protection and conservation efforts.
像海牛这样的濒危物种需要我们的保护和保育工作。
Manatees are known for their slow-moving, gentle nature.
海牛以其缓慢移动、温和的性格而闻名。
In Florida, boaters are required to watch out for manatees in designated areas.
在佛罗里达州，船员在指定区域必须注意海牛。
The manatee's diet primarily consists of sea grasses and other underwater vegetation.
海牛的主要食物是海草和其他水下植物。
Manatees can weigh up to 1,200 pounds and grow up to 13 feet long.
海牛可以重达1200磅，长到13英尺长。
These gentle giants have no natural predators.
这些温和的巨兽没有天敌。
The West Indian manatee is a subspecies found in both the Caribbean Sea and the eastern coast of the United States.
西印度海牛是一个亚种，分布在加勒比海和美国东海岸。
Manatees communicate with each other using a variety of vocalizations, including grunts and squeaks.
海牛通过各种声音交流，包括咕噜声和吱吱声。
Conservationists work tirelessly to reduce threats to manatees, such as boat strikes and habitat loss.
保护主义者不遗余力地减少对海牛的威胁，如船只撞击和栖息地丧失。