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Mantis religiosa
The praying mantis I found was on my front porch and stayed there for about a week. It was about four inches long and was a brownish green color.
The praying mantis tends to live in grassy and temperate climates. They typically choose areas that they are able to use their camouflage to blend in with the surroundings.
Mantids tend to eat smaller bugs. They use their careful camouflage to hide from predators such as birds and small rodents like squirrels. They grow to be about .5 to 6 inches in length. They live anywhere from 2 to 14 months typically.
Beautiful find! The coloration and shape of this mantis is more consistent with a Chinese Mantid. Here is a link to images of Mantis religiosa (European Mantis) so you can compare to the pictures in the link I provided in my ID suggestion:
http://bugguide.net/node/view/22947
I hope this helps!