animals antenna appendage bug closeup details grasshopper green hopper India insect krayker leags macro pest afterfeather barbicels barbs barbules bird branched branches bright calamus color coloration colored colorful colors colour coloured colourful colours complex integumentary appendage coverts display distinctive elongated-coverts epidermal-growth extravagant eye-spotted tail eye feather feather’s-eye flying-bird interlocking barbules iridescence iridescent outer-covering pavo peacock peafowl pen phasianidae plumage plume rachis shaft tail vane