The exact reason for the decline in the 1950s is unknown as well. The Fish & Wildlife Services states that the eagles declined in the 1950s because of DDT. The problem with that statement is the fact that the bald eagle was recovering for many years before the nation banned DDT.
Elephants in the wild live to a range of 50 to 70 years. For well kept and fed animals in captivity, the oldest recorded is 82 years.
Living to an estimated age of nearly 400 years, a female Greenland shark has set a new record for longevity, scientists have revealed. The discovery places the lifespan of the Greenland shark far ahead of even the oldest elephant in captivity, Lin Wang, who died aged 86. It is also far longer than the official record for humans, held by 122-year-old Frenchwoman Jeanne Louise Calment.