Catgut, a natural absorbable suture is obtained by longitudinally slitting the intestinal submucosa of sheep and goat, twisting the ribbons and joining them in wet condition giving monofilament finish. Catgut have 2 colors: natural or plain (ivory -cream color) and Chromic (dark brown color).For a long period, catgut was the most common material for the strings of harps, violins, and as well as other stringed musical instruments.
More info and pictures at The FlyFisher
Hook: Mustad R50 # 10-16
Tying Thread: Dyneema
Tail: Natural deer hair
Body: Floss
Shell back: Deer hair
Hackle: Furnace cock
Wings: Deer hair
This popular western pattern comes in many variants of colour, wing and tail materials, hackle and single and double hump. The Humpy is also tied in two styles, short and fat and the long and slim version I am tying here. Although made to imitate nothing in particular, except a juicy mouth full, this has a reputation of being a difficult fly to tie, but as I have mentioned in earlier step by step posts, follow the procedures and proportions and you will soon be banging them out by the dozen.
Full step-by-step via The Feather Bender
Hook: Mustad C49SNP-BR # 12-8
Thread: Dyneema
Body: Melt Glue
Gills/rib: Olive Ostrich herl
Thorax/Head: Black and brown Antron dubbing and CdC
Full step-by-step at The Feather Bender