Fig. 3
Download original image
(Left) Actinemys turtle with a very worn plastron, for which the estimated age could not be determined and is assigned an age of >20 years. (Right) A turtle with well-defined annual rings for which an exact age could be estimated (photograph by David J. Germano).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.