<p>Sulphur-crested cockatoos are large birds, measuring 45 to 50 centimeters in length. Their average weight is 800 grams. Sulphur-crested cockatoos are white with a distinctive sulphur-yellow crest which can be erected or held folded down on top of head. The underside of their wings and tail is pale yellow. Females and males are similar in appearance (monomorphic); however, females can be identified at close range by their red tinted brown eyes, whereas males have darker brown eyes. There are four subspecies of sulphur-crested cockatoos. <span class="taxon"><em>Cacatua galerita fitzroyi</em></span> differs from <span class="taxon"><em>C. g. galerita</em></span> in having a pale blue eye ring instead of white, the yellow feathers are slightly darker, and the crest feathers are longer. <span class="taxon"><em>Cacatua galerita eleonora</em></span> and <span class="taxon"><em>C. g. triton</em></span> both average smaller in overall size than <span class="taxon"><em>C. g. galerita</em></span>.<span> (Australian Museum, 2003; Bell, 1969; Dobbs and Highfill, 2003)</span></p> <p><strong>Other Physical Features: </strong>Endothermic; Homoiothermic; Bilateral symmetry</p><p><strong>Sexual Dimorphism: </strong>Sexes colored or patterned differently</p><p>>p
- Bell, A. 1969. Common Australian Birds. London: Oxford University Press.