The width of a scarf matches the height of a human neck, so a scarf for an ostrich would look closer to a blanket. That or a tube sock.
Edit: I just realized, given the length of the ostrich and relative proportions, a human scarf would be closer to a decorative necklace or choker.
Great thread - might make my icons a little smaller but I have a big phone (for my hand) so I tried to balance minimalist with color-immediacy