Yes that is a roundworm. I would either get Valbazen or SafeGuard liquid Goat Wormer and treat them all individually. Shake the bottle well. Valbazen is easiest and dosage is 1/2 ml orally, then repeat in 10 days. SafeGuard dosage is 1.5 ml for. 5 pound chicken given once and in 10 days for only roundworms. Give it for 5 consecutive days for most all chicken worms.