how many times can a spitting cobra spit its venom?
I presume it can only spit once or twice only An unwise presumption.


  These cobras exhibited distinct control of venom flow with spits averaging 1.7% of the volume of the venom gland, thus enabling the cobras to rapidly expel over 40 consecutive spits ... There was no significant difference in the amount of venom spat between the first few spits and the 20th spit, however there was a significant (Student's t-test with unequal variance, p=0.017) decrease in the amount of venom spat between the 20th and 40th spits. 


--Protein variation in the venom spat by the red spitting cobra, Naja pallida (Reptilia: Serpentes)