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.
The blue whale is the largest animal known to ever have existed. When people think about the largest animals that ever lived, dinosaurs are often the first thing to come to mind. It might come as a surprise that the largest animal ever recorded still lives today, although it is on the endangered species list. Others were indeed prehistoric creatures that would have dwarfed today's largest land animal, the African elephant, weighing about 14,000 pounds.