Editing Acclimatization (section)

===Morphological===
Organisms are able to change several characteristics relating to their [[morphology (biology)|morphology]] in order to maintain performance in novel environments. For example, birds often increase their organ size to increase their metabolism. This can take the form of an increase in the mass of nutritional organs or heat-producing organs, like the pectorals (with the latter being more consistent across species<ref name="LiknesSwanson2011">{{cite journal|last1=Liknes|first1=Eric T.|last2=Swanson|first2=David L.|title=Phenotypic flexibility of body composition associated with seasonal acclimatization in passerine birds|journal=Journal of Thermal Biology|volume=36|issue=6|year=2011|pages=363–370|issn=0306-4565|doi=10.1016/j.jtherbio.2011.06.010}}</ref>).<ref name="McKechnie2008">{{cite journal|last1=McKechnie|first1=Andrew E.|title=Phenotypic flexibility in basal metabolic rate and the changing view of avian physiological diversity: a review|journal=Journal of Comparative Physiology B|volume=178|issue=3|year=2008|pages=235–247|issn=0174-1578|doi=10.1007/s00360-007-0218-8|pmid=17957373|s2cid=28481792}}</ref>