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.
Biggest Whale-Basilosaurus (60 Tons). Basilosaurus (Nobu Tamura). Unlike the other mammals on this list, Basilosaurus can't lay claim to being the largest-ever of its breed--that honor belongs to the still-extant Blue Whale, which can grow to as much as 200 tons.
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.