Reptiles[1] are the animals that live
the longest. The turtle[2]'s long life is legendary. But no one
has ever been able to calculate the exact age of the turtle, and for good
reason, tortoises live a lot longer than humans do. According to certain ancient documents and by cross checking[3]
it would seem that the oldest turtles found have been over a century
and a half old. But it's quite possible they can live even longer than
that. Crocodiles also have long lives. But their exact age is hard
to calculate too. Scientist makes estimations based on the animal's size because
reptiles grow all their lives. In other words, the bigger it is, the older
it is. So certain reptiles is probably a century old but the average life-span[4]
is between 60 and 70 years. The same is true for mammals[5]. The biggest are the ones
that they can hope to live the longest. The elephant lives to be more than sixty years old. But it doesn't
really die of old age. In fact this mammoth has only four teeth plus two
tusks, and they wear out[6] over the years. When the animal becomes old it's incapable of grinding up the
vegetation it needs to eat and it starves to death. If one day, a parrot tells you it's 100 years old, don't believe
it. Parrots live to be fifty years old which is a very good age for a
bird. Crows also live a long time, the animals that live the longest
are always those that are raised in captivity. In other words taking care
of and not in danger, but which is better, to live a long time caged up
or a little less long but free?
当前位置：洪恩在线
-> 轻松英语 ->
休闲英语 -> 环宇时空
