805c6b55_thanasia___Conditional_Methods__5
[0] Carbon monoxide (bottled gas only) [1] Hypoxia [2] Combines with hemoglobin, preventing its combination with oxygen [3] Moderate onset time, but insidious so animal is unaware of onset [4] Requires appropriately maintained equipment [6] Nonhuman primates, free ranging wildlife [7] Effective, acceptable only when equipment is properly designed and operated [5] 
Extremely hazardous, toxic and difficult to detect
Euthanasia - Conditional Methods