North American species live from spring to fall. Tropical species can live up to 1 year. The female excretes a pheromone to attract males. Eggs can be laid as early as a day later. Nymphs hatch after a month in the tropics, or after the winter has passed in temperate regions. Mantids only undergo a partial metamorphosis from the nymph to adult stage. Nymphs resemble adults, but lack fully-developed wings. They molt 6 or 7 times before becoming adults.