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This little critter was on the railing of our back porch. He is an herbivorous (vegetarian) insect, and feeds mostly at night.  As the name suggests, they look like a stick.  Their wobbly movement is similar to a stick being blown about in the wind.  Their habitat is mostly trees, bushes, and plants.  Because of their shape, they are extremely difficult to see.  They blend in with their environment to ward off their predators, such as birds, rodents, and even small reptiles.

There are approximately 3000 different species of the walking stick.  Some are more flat, giving them the appearance of a leaf.

The female can lay up to 1500 eggs and look like brown seeds, which can lay dormant for months.  When they do hatch as a nymph, they resemble the adult walking stick.  While a female can reproduce on her own, she will only produce other females.  Their adult size is anywhere from one to twelve inches long, depending upon the species.  Their life span is from one to two years. 
 

Sources:

http://a-z-animals.com/animals/stick-insect/

https://www.nwf.org/Wildlife/Wildlife-Library/Invertebrates/Walking-Sticks.aspx

http://animals.nationalgeographic.com/animals/bugs/stick-insect/

WALKING STICK