Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
July 4
Berkeley - When swimming the water skrew make
long alternate strokes with the back feet and also
with the front feet when on the surface, don't I'm
not sure whether he uses the front feet when
under water; he may just them tick along his