Subject: Dwarf sperm whales

S. Jones (
Mon, 9 Nov 1998 20:32:00 -0800 (PST)

On Sun, 8 Nov 1998 wrote:

> I have two questions:
> What is the average weight of a Dwarft Sperm Whale?
> How many years does it take a whale to reach its adult size?
> Thank you, Cindy

Dear Cindy,

The average weight of an adult dwarf sperm whale is from 136-272 kg.  The
average length is 2.0-2.7 meters.

Whales reach their adult size later than they become able to reproduce.
The milk of females whales that nurse their young is very high in fat
content and by the time the young whale stops taking milk from its mother
(typically six to seven months) it is already half its adult size.  From
that point, growth is gradual.  For mysticete whales (baleen whales),
physical maturity occurs around the fifteenth year of life.  Sperm whales
(odontocetes) are physically mature at about age 35.

Hope this information was helpful.