Whether they’re opening for takeoff, spreading wide for a lazy soar or flapping to brake for landing, bird wings make flying ...

Flight: wing tips are more pointed than those of the other common buteos, and the trailing edge is almost straight. Adult has pale wing linings and flight feathers contrasting with dark primary ...

Inhibiting the sonic hedgehog (Shh) pathway strongly perturbs feather development in chickens by restricting feather bud ...

Black wings with yellow lesser coverts and narrow white tips to greater coverts, forming 2 white wing bars along with white edging to the tertials. White inner webs to most of the tail feathers.

Alteration of the expression of the co-called 'Sonic Hedgehog' gene can transform feet scale and wing feathers. While a transient over-expression of the gene can permanently turn feet scales into ...