Definitions
Century Dictionary and Cyclopedia
- Having the wings marked as if with letters: specifically said of a kite, Elanus scriptus.
Examples
“In their wake, many birds of prey, most notably the largely nocturnal letter-winged kite (Elanus scriptus) also reach unusually high population densities and extend their geographic range well beyond their normal center in the Mitchell Grass Downs.”
“In 1992, an upsurge of feral cats in the Diamantina region of western Queensland threatened native fauna, including the letter-winged kite.”
Lists
These user-created lists contain the word ‘letter-winged’.
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Hedgepiglet
Words for things both tangible and nonanthropic
rorqual, vellus, wrasse, rainbow bee-eater, tinkershire, lemonquat, boomslang, tufted vetch, cubeb, nipplefruit, madapple, wad and 447 more...
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Bird Wirds: Adjectives
Adjectives used in actual (non-taxonomic) bird names, past and present.
roseate, glossy, whooping, neotropic, pelagic, ferruginous, crested, whiskered, marbled, tufted, horned, eared and 818 more...
Tweets
Looking for tweets for letter-winged.

reesetee Haha! That's pretty much what I was thinking too, yarb. Then I thought, "But which letter?" Turns out it's a W. Here's a photo of the lovely bird in question. Jan 8, 2008
yarb Sounds like a Homeric epithet:
'Odysseus, letter-winged, crafty in colloquy, spoke to the suitors thus...' Jan 8, 2008