File:Lepidosiren annectens using the air bladder as a lung 002.jpg

Summary
Lepidosiren annectens using the air bladder as a lung Date: 1881-1882 Source: Popular Science Monthly Volume 20 Author: unknown

This image is in the public domain because its copyright has expired. This applies to Australia, the European Union and those countries with a copyright term of life of the author plus 70 years.