RBC differences in male and female vertebrates

[assadimm at guvax.acc.georgetown.edu]

It is commonly known that in adult humans, males have approximately 
one million more red blood cells per cubic centimeter than do females. 
 I would like to know if any other vertebrates exist with a similar 
discrepancy between male and female red blood cell counts (or, for 
that matter, hematocrits). 

If you have any suggestions to offer, please forward them to:

massad01 at dml.medlib.georgetown.edu

I thank you greatly.