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 largest land animal that ever lived is likely Amphicoelias fragillimus, a sauropod dinosaur known only from a single vertebra fossil fragment, measuring 1.5 m (5 ft) in height, which has since been lost. In its complete form, it was estimated the entire vertebrae fossil would have been 2.7 m (8.8 ft) tall.