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.
Tallest Animal. The Blue Whale: The Blue Whale with 30 metres in length and 170 tonnes or more in weight is the largest known animal in the earth. This largest animal in the earth can eat 4 to 8 tons (3.6 to 7.3 metric tons) of krill per day.