It's down to just a final, furry 4 potential nicknames for our hypothetical placental ancestor! Vote for the two finalists now.

A video series on amnh.tv delves into the topic of dinosaurs, which arose some 230 million years ago and thrived until large dinosaurs became extinct about 65 million years ago. How did dinosaurs reproduce? A video explains.

Okay, just 8 possible nicknames left. Does our hypothetical common placental ancestor look more like a Placentor or a Mancestor? Nova or Hypotheshrew? Make your vote today for a final, furry 4!

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.