Personalized Nerd Birdwatcher Blue Long Sleeve T-Shirt. Funny Long Sleeve T-Shirt - Charcoal for birders, birdwatchers and twitchers for their Big Day or Big Year with binoculars and bird graphic says This Nerd Watches Birds. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL