While the world's biggest creatures are enormous, with some still far smaller than the biggest beasts of prehistoric times, which went extinct millions of years ago, some of their populations are becoming more and more endangered, almost on the brink of extinction.

For example, the biggest sea animal is the 100-ton blue whale, which is considered to be endangered according to multiple scientific reports. Yahoo News reports that there are only about 15,000 of them left to this point because they were massively hunted in the early twentieth century.

The most famous of all extinct animals, the dodo, became extinct hundreds of years ago. The flightless bird, known to only inhabit the African island of Mauritius, stood about a shade over three feet tall and weighed about 45 pounds.

The dodo also became the classic example of just how much humans can contribute to extinction. So, will humans play the part in eradicating some of the world's biggest animals in today's day and age? And if so, which of those animals will be first to go?

Take a look at some, both endangered and abundant, who could be wiped out or are already wiped out below:

Giant Weta

The Weta, found in New Zealand just this year, is the heaviest insect ever recorded. The bug weighs in at 2.5 oz., 14,000 times the weight of an ant, according to Yahoo News. Oh yeah, and it's capable of eating a carrot.

Argentinosaurus

This extinct animal, who had thighs the size of car, was 10 times more heftier than today's biggest land mammal, the African elephant, which only weighs about seven tons, according to Yahoo News. The dinosaur lived on South America somewhere between 97 and 94 million years ago, during the mid Cretaceous Period. You can probably guess which country it made the earth tremble.

 Megaloprepus caerulatus

This Central American dragonfly is the biggest flying insect, boasting a seven-and-a-half inch wingspan. If that's not big enough for you, its extinct relatives had a wingspan of 30 inches. It's also larger than the biggest currently living butterfly, the Queen Alexandra's Birdwing of Papua, New Guinea, which flutters on 12-inch wings...And, is poisonous.

The Leatherback Sea Turtle

The Leatherback is the biggest sea turtle, but its critically endangered: females now nest a quarter of what they nested about 30 years ago. It can easily be differentiated from other modern sea turtles by its lack of a bony shell. Instead, skin and oily flesh cover its carapace.

Flemish Giant

This breed of domesticated rabbit originated in the Flemish region in Europe, weighing anywhere from 12 to 50 pounds, according to reports. If you're dog needs a friend, look no further, because they can be the same size.

Yahoo