Cut-through narwhal tusk displaying the individual year rings (IMAGE)

McGill University

Cut-through narwhal tusk displaying the individual year rings

Caption

Analyses of the individual layers of narwhal tusks have provided information about their food choice and their exposure to mercury throughout their life.

Credit

Rune Dietz

Usage Restrictions

Credit image.

License

Licensed content

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.