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 lived in the Jurassic Period, around 150 million years ago. The Apatosaurus is one of the largest animals to have ever walked on Earth, averaging around 23m (75ft) in length and a weight of over 23 metric tons.patosaurus lived in the Jurassic Period, around 150 million years ago. The Apatosaurus is one of the largest animals to have ever walked on Earth, averaging around 23m (75ft) in length and a weight of over 23 metric tons.