lower1. 1  to cause to descend; let or put down: to lower a flag. 2  to make lower in height or level: to lower the water in a canal. 3  to reduce in amount, price, degree, force, etc. 4  to make less loud: Please lower your voice.
Most people believe that the largest animals to ever exist on Earth were the dinosaurs. However, one of the largest land dinosaurs, the sauropod Argentinosaurus, weighed only about 180,000 pounds (81,647 kg). That's little more than half the size of an adult blue whale. It makes a lot of sense that the world's largest animal would be a sea creature. Land animals have to support their own weight, whereas sea creatures get some help from the water. It is believed that at one time there were more than 200,000 blue whales.
Apatosaurus was one of the largest animals that ever lived. Some people believe the earth shook when this dino walked. It could grow to over 85 feet long and over 15 feet tall at the hips. Apatosaurus is known for its very long neck, which made it easier to eat greens from trees. They also had big feet: yard-long footprints (called trackways) from this big guy have been found in Colorado.