Subject: Insect Hemoglobin and poisons

One of my students wrote a final exam paper on the properties
of hydrogen cyanide.  He was puzzled to find that insects are
susceptible to CO poisoning, but seemingly are immune to HCN.
He postulated that insects have a different oxygen carrier in
their circulatory "systems."

Anyone have any solid data on this?  I promised him I'd poke 
around over the summer ...

Thanks, 
Amanda Kahn
 

Re: Insect Hemoglobin and poisons