I think it was Basilosaurus (also more correctly named Zeuglodon). It measured around 60 feet long and 100 tons (I dont know what kind of tons, though). I haven't done extensive research, but as a rule things can get bigger in the water than they can on land, and the website I checked said it rivaled the sauropods for size. Good place to start your research if nothing else.
the same as today, the blue whale.
the biggest animal in Montana is the bison
The biggest animal to ever live is the Blue Whale.
The biggest animal on foot is probably an elephant.
the biggest animal in desert is camel
The biggest animal on earth is the blue whale.
Because it is the biggest animal on earth.
The biggest animal on land is the Elephant AND The biggest animal in water is the Blue Whale
In the animal kingdomm the biggest animal is the Blue Whale therefore the Blue Whale has the biggest babies and family.
The Blue Whale is the biggest animal on Earth.
Yes the blue whale is the biggest animal in the world.
Yes the blue whale is the biggest animal in the world.