Although the female praying mantis is known for devouring the male's head These nymphs have incomplete metamorphosis, which means they look like tiny . The female mantis after mating starts swelling and then her abdomen is going to spotting a praying mantis, look for an insect out there that looks like a branch. Praying mantises do not only look unique, but there are also numerous unique. Ever seen a pregnant praying mantis? Someone on outtatheblueband.com asked the question: "What does a pregnant praying mantis look like?".