Nearly 3,000 people cast their vote during our first round of March Mammal Madness, narrowing the possible names for our hypothetical common placental ancestor down to 16. Help us narrow down the choices even further by voting for your favorites below. You have until 5 pm EDT on Tuesday, March 19, to make your selections.

The “Name Your Ancestor” contest resulted in more than 1,000 name suggestions for the hypothetical common placental ancestor that scientists described last month. The top 32 contestants, as selected by the Museum and WNYC’s Radiolab, range from serious to silly. Starting today, we need your help to pick the winning moniker for this small, furry, insect-eating mammal. 

What did extinct dinosaurs eat—and how do we know it? Find out more from Michael J. Novacek, the Museum's provost of science, and Mark A. Norell, chair of the Division of Paleontology, in a video. 

Like hippos, their closest living relatives, whales are descended from an ancestor that had four legs and walked on land, a transition explored in the upcoming exhibition Whales: Giants of the Deep, opening March 23.

Visit the David H. Koch Dinosaur Wing on the Museum's fourth floor, and you'll find a bevy of fossil dinosaurs, in two separate halls. One is the Hall of Ornithischian Dinosaurs (Or-nuh-THISH-ee-an); the other is the Hall of Saurischian Dinosaurs (Sawr-ISH-ee-an). A video explains the difference.