Photographed in Nyungwe Forest Heart of Africa. Starring the female of my favourite Hornbill species in the aviary, whom I haven't been seeing in a good while.
On a random note, despite their name, there doesn't seem to be a source online (at least not behind a paywall) where the tail length of this species is stated anywhere for some reason.
From Kemp, A. 1995. The hornbills. Oxford University Press, Oxford.
In response to a question...
This was published in 1995, before they were split, so Tockus albocristatus albocristatus and T. a. macrourus are now the 2 subspecies of Western Long-tailed Hornbill, and T. a. cassini is split and now the Eastern Long-tailed Hornbill.
@LeMandaiEnthusiast‧ That's the problem with splitting up and renaming species or other taxa.
The original purpose of Linnaeus's classification system, which was to assign scientific observations clearly to a species and so make the observations searchable, no longer works today.