Second Species of Ibis with the Sacred Ibises on the Rwanda 1975 34F - A Solution!

I have received a suggestion from Gaétan Duquette of Canada that the bird is the Straw-necked Ibis (Carphibis spinicollis).  I reluctantly agree and wonder why the artist/designer chose to include an Australian species in a set which otherwise shows only ones from Africa. Perhaps it was a joke.

The illustration below is taken from "Birds of Australia" by J D Macdonald (1973) illustrated by Peter Slater.
 
 
Head and neck of the Straw-necked Ibis Mystery Ibis on Rwanda stamp
Straw-necked Ibis Ibis on Rwanda stamp

Published 27 January, 1999

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