One clip names both of them

1.6 million views between them.

Harbour seal outweighs Sea otter 3.4× — 94.3 kg against 27.4 kg. Both figures are averages across males and females.

Tale of the tape

Body mass

27 kg

🦦 Sea otter · COMBINE

94 kg

🦭 Harbour seal · COMBINE

Body length

0.35 m

🦦 Sea otter · COMBINE

1.81 m

🦭 Harbour seal · COMBINE

Maximum lifespan

30 yr

🦦 Sea otter · COMBINE

48 yr

🦭 Harbour seal · 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 Caniformia (suborder), home to 469 species.

We know what their shared ancestor was, but not when it lived — no dated family tree spans both of them yet.