"High above the mountains and rocky hills of most lands flies a sharp-eyed monster known as the peryton. Intelligent, patient, and malevolent, it waits for prey whose heart it might pluck out." (AD&D 2e Monstrous Compendium 11: Forgotten Realms Appendix, TSR, 1991 -- Looks like this one is by Mark Nelson.) Though the peryton was first described in the 1950s, most early illustrations depict a noble-looking creature that could have stepped out of medieval heraldry. This one appears much more dangerous, a viciously fanged diving raptor. The 2e text finally mentions the peryton's human shadow, shown in the 1e Monster Manual but not described there.