Jizz is a birding term to describe a birds unique overall character and impression using shape, proportions movement etc.
Once you become familiar with a species you pick up on the jizz to make a quick ID. Sometimes it gets you to a bird family quickly, or sometimes straight to a particular species.
The words origin is unknown- the WW2 origin is probably wrong as the term apparently appeared first in the 1920s
S
For an interesting debate on jizz see-
rdp1710.wordpress.com/.../jizz-birding-and-all-that-jazz
Thanks Seymour - an interesting read.
SB
ps - By the way, nice to see you on here, hope you are well.
Thanks for coming up with a better description of jizz than mine Seymour,mine was what we were told in the old Royal Observer Corps days,dates me a bit that does.I still find it useful in the field when you cannot get those textbook i.d. points