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. Digital Vision/Digital Vision/Getty Images. 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.