@birdsandbirddogs: Blood feathers.. also known as pin feathers.. are how birds grow in new feathers! They are grown in a keratin sheath (same substance hair and nails are grown out of) and when they are finished growing in the blood supply recedes out of the shaft and they are left hollow, which is what allows them to fly! The bird themself or their parrot friend might preen the sheath off the feather for them when its done growing #fyp #macawsoftiktok #birdsoftiktok #freeflight #freeflighttraining #florida #parrotsoftiktok