We don't know where they migrate to or from, where they mate, where they have their pups, and yet, hammerhead populations in the Atlantic have declined about 80 percent in the last 20 to 30 years.
我们不知道它们从哪儿迁徙而来，要迁徙到哪儿去， 它们在哪儿交配，在哪儿抚育幼仔， 然而，锤头鲨在大西洋的种群 在最近的二三十年内减少了大约百分之八十。