Described as Little Known, Already Gone

Steller's sea cow wore hide an inch thick, scarcely able to be cut with an axe.

Instead of teeth, Steller's sea cow ground food between two horny plates built of innumerable tubes.

Cuvier recorded that the heart of Steller's sea cow was double.

The book calls Steller's sea cow little known; it had been extinct since 1768, eighty years.