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. Author manuscript; available in PMC: 2010 May 21.
Published in final edited form as: Int J Dev Biol. 2009;53(5-6):813–826. doi: 10.1387/ijdb.072556cc

Fig. 5. Possible models for feather and hair evolution.

Fig. 5

(A) Possible models for the evolution of feathers. Experiments show that the barb - rachis model is correct. (B) Possible models for the evolution of hairs. The pit-like structures are shown in Figs. 2 and 4. This drawing is from Fig. 6 B,C of Wu et al., 2004.