Fig. 7

Differences in the upper and lower eyelids structure between Strigiformes. (a) – Boreal Owl; (b) – Eurasian Eagle-Owl; (c) – Snowy Owl; (d) – Little Owl; (e) – Northern Hawk Owl; (f) – Ural Owl; (g) – Tawny Owl; (h) – Philippine Scops-Owl; (i) – Western Barn Owl. bv – blood vessels, e – epithelium, lp – lamina propria, m – melanocytes, mz – marginal zone. a – e, g – i = Mayer’s H&E stain; f = picro-Mallory trichrome stain. Scale bars: b, c, e – h = 20 μm; a = 10 μm; i = 5 μm