Here is a very useful PDF about the differences between Cormorants. This article details in depth; areas in which one can tell the difference between the Temminck’s (Japanese) Cormorant, and the Great Cormorant more easily. This helpful article, is with greatest thanks written by Nick Lethaby & Nial Moores.
Found in “Dutch Birding, Vol. 21, #1, 1999“.
copyrighted and with thanks to: Dutch Birding and its authors above.