The birds appear to have been freshly killed or stunned , and were drawn by the Dutch artist Joris Joostensz Laerleon on Mauritius , but they were not published until 1969 .
The birds appear to have been freshly killed or stunned . 
 The drawings were made by the Dutch artist Joris Joostensz Laerleon on Mauritius , but were not published until 1969 .