 Subfossils of the Réunion ibis show that it was more robust , likely much heavier , and had a larger head than the African sacred and straw @-@ necked ibises . It was nonetheless similar to them in most features . Rough protuberances on the wing bones of the Réunion ibis are similar to those of birds that use their wings in combat . It was perhaps flightless , but this has not left significant osteological traces ; no complete skeletons have been collected , but of the known pectoral elements , only one feature indicates reduction in flight capability . The coracoid is elongated and the radius and ulna are robust , as in flighted birds , but a particular foramen between a metacarpal and the alular is otherwise only known from flightless birds , such as some ratites , penguins , and several extinct species . As contemporary accounts are inconsistent on whether the solitaire was flightless or had some flight capability , Mourer @-@ Chauvire suggested that this was dependent on seasonal fat @-@ cycles , meaning that individuals fattened themselves during cool seasons , but were slim during hot seasons ; perhaps it could not fly when it was fat , but could when it was not . However , Dubois specifically stated the solitaires did not have fat @-@ cycles , unlike most other Réunion birds . 
 Subfossils of the Réunion ibis show that it was more robust , likely much heavier , and had a larger head than the African sacred and straw @-@ necked ibises . It was nonetheless similar to them in most features . Rough protuberances on the wing bones of the Réunion ibis <a href='drop_aux' title='1'><mark>are</mark></a>similar to those of birds <a href='null_relcl' title='2'><mark>that</mark></a>use their wings in combat . It was perhaps flightless , but this <a href='been_done' title='3'><mark>has</mark></a> not left significant osteological traces ; no complete skeletons <a href='been_done' title='4'><mark>have</mark></a> been collected , but of the known pectoral elements , only one feature <a href='uninflect' title='5'><mark>indicates</mark></a> reduction in flight capability . The coracoid is elongated and the radius and ulna <a href='drop_aux' title='6'><mark>are</mark></a>robust , as in flighted birds , but a particular foramen between a metacarpal and the alular is otherwise only known from flightless birds , such as some ratites , penguins , and several extinct species . As contemporary accounts <a href='drop_aux' title='7'><mark>are</mark></a>inconsistent on whether the solitaire was flightless or had some flight capability , Mourer @-@ Chauvire suggested that this was dependent on seasonal fat @-@ cycles , meaning that individuals fattened themselves during cool seasons , but <a href='uninflect' title='8'><mark>were</mark></a> slim during hot seasons ; perhaps it could not fly when it was fat , but could when it <a href='negative_concord' title='9'><mark>was</mark></a> <a href='negative_concord' title='10'><mark>not</mark></a>. However , Dubois specifically stated the solitaires did not have fat @-@ cycles , unlike most other Réunion birds . 
Subfossils of da Réunion ibis show that it was more robust , likely much heavier , and had a larger head than tdaAfrican sacred and straw @-@ necked ibises . It was nonetheless similar to them in most features . Rough protuberances on the wing bones of thdaéunion ibis similar to those of birds use their wings in combat . It was perhaps flightless , but this done not left significant osteological traces ; no complete skeletons done been collected , but of thedaown pectoral elements , only one feature indicate reduction in flight capability . The daacoid is elongated and the radius and ulna robust , as in flighted birds , but a particular foramen between a metacarpal and the alular is otherwise only known from flightless birds , such as some ratites , penguins , and several extinct species . As contemporary accounts inconsistent on whether the sdataire was flightless or had some flight capability , Mourer @-@ Chauvire suggested dat dis was dependent on seasonal fat @-@ cycles , meaning that individuals fattened themselves during coo seasons , but was slim during hot seasons ; perhaps it could not fly when it was fat , but could when it ain't . However , Dubois specifically stated the sodaaires did not have fat @-@ cycles , unlike most other Réunion birds .