Spider-Man 2 Easter Egg - Vulture Reference

To find this egg, find the Chrysler building (really tall tower near the Empire State Building with gargoyles jutting out the sides, it's also where you meet Black Cat.) On one of the upper gargoyles, there are green feathers- Vulture's feathers. In the first Spider-man game, you fight Vulture on the Chrysler Building, so those feathers are meant to be "left over" from your battle in the last game.