context: Watermelon males have ankles spurs that produce a species-specific mixture of poisons. It contains at least 19 different ingredients and consists mainly of defensin-like peptides (DLP), C-type natriuretic peptides (CNP) and nerve growth factors (NGF). The amphibian poison has developed independently from the development of the reptile poison. [23] The poison does not excrete throughout the year, but only during the mating season of aquatic animals [24]. Poison-producing glands are developed from the sweat glands and are located between the knees and the feet of the male hind limbs. [10] [24] The kidney-shaped glands in both hind legs are connected by thin-walled tubules to the heel spur. Females have immature spur knots, like the beak, which disappear before the end of the first year of life. Females lack functional toxin trophies. [10]
question: Where in the body of a spider is a poison?
answers.text: ankles