One clip names both of them

6,546 views between them.

Blue whale outweighs Sea otter 5440× — 149,000 kg against 27.4 kg. Both figures are averages across males and females.

Tale of the tape

Body mass

27 kg

🦦 Sea otter · COMBINE

149,000 kg

🐋 Blue whale · COMBINE

Body length

0.35 m

🦦 Sea otter · COMBINE

30 m

🐋 Blue whale · COMBINE

Maximum lifespan

30 yr

🦦 Sea otter · COMBINE

110 yr

🐋 Blue whale · COMBINE

Bars are sized against the larger of the two figures.

Animals caught on camera

Real footage of the animals on this site — hunting, fighting, and getting on with it.

Shared ancestry

The closest group they share is Laurasiatheria (superorder), home to 4,193 species.

They last shared an ancestor about 64 million years ago.

Estimates range from 58 to 76 million years; the figure above is the middle estimate.

About this estimate

Dates from Upham, Esselstyn & Jetz 2019, PLoS Biology 17:e3000494 (CC0).