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A sperm whale tooth cut in half lengthwise, showing the annual growth lines (highlighted in pencil). The oldest (earliest) growth layers are at the tip, and the most recent growth layers line the inside of the pulp cavity. This individual was 25-30 years old. On board the Iskatel, Sea of Okhotsk, Russia.

Credit to read: Photo by Misty Nikula (PolarTREC 2007), Courtesy of ARCUS

Photographer: Misty Nikula
Category: 
Year: 
2007
Program: 
PolarTREC
Region: 
Russia
Topic: 
File Information
Focal Length: 
6.3mm
File Size: 
2552176
Computed Mime: 
image/jpeg
Max Aperture: 
f/3.3
Height: 
2112
Width: 
2816
Make: 
PENTAX Corporation
Model: 
PENTAX Optio WPi
Exposure Time: 
1/40s
ISO: 
160

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