What’s the scariest extinct animal?

What’s the scariest extinct animal?
Eight of the Most Nightmarish Prehistoric Animals

Basilosaurus. Whales haven’t always been ocean-dwellers—their ancestors lived on land, and they moved to the water about 50 million years ago.
Therizinosaurus.
Meganeuropsis.
Arctodus smilus.
Tully monster.
Eurypterid.
Thylacosmilus.
Archaeotherium.

Eight of the Most Nightmarish Prehistoric Animals
  1. Basilosaurus. Whales haven’t always been ocean-dwellers—their ancestors lived on land, and they moved to the water about 50 million years ago.
  2. Therizinosaurus.
  3. Meganeuropsis.
  4. Arctodus smilus.
  5. Tully monster.
  6. Eurypterid.
  7. Thylacosmilus.
  8. Archaeotherium.