Llamas are able to live at high altitude where atmospheric pressure is lower and the partial pressure of oxygen in the air is lower.They have efficient mechanisms of oxygen extraction from the air.Llama haemoglobin differs from the human haemoglobin in that it has 25 different amino acids in the alpha chain and 24 different amino acids in the beta chain.Llama haemoglobin has a high affinity for oxygen both at sea level and at altitude. The oxygen dissociation curve is shifted to the left of the oxygen dissociation curve for humans.