Many organisms have haemoglobin.There are different types of haemoglobin in different organisms.The different types of haemoglobin have different properties due to slightly different primary structures (sequence of amino acids).The different primary structures lead to different tertiary and quaternary structures which results in different binding affinities for oxygen.The different haemoglobins are adaptations to different environments and conditions.In humans, fetal haemoglobin has a higher affinity for oxygen than adult haemoglobin.Llama haemoglobin has a higher affinity for oxygen than human haemoglobin. Llamas live at high altitude where the partial pressure of oxygen is low.