There are 20,000 species of butterflies on the planet, with over 725 different species in North America alone.  Before going out to look for caterpillars, you may want to do some research about which caterpillars are native to the area that you live.  You can often find a list of native caterpillar or butterfly species on your state’s official website. Try asking the librarian at your local library to help you locate books and periodicals that can help you identify native caterpillars in your area. You can find a list of state wildlife websites to help you find caterpillars here: https://www.fws.gov/offices/statelinks.html Once you have identified the types of caterpillars in your region, you can narrow down your search by what kind of caterpillar you’d like to have for a pet.  Different kinds of caterpillars develop into different kinds of moths and butterflies, so you may choose one based on its caterpillar state, or on what type of butterfly you’d like to see emerge from the cocoon.  Some caterpillars can be dangerous to touch.  You may want to take that into account when choosing a type of caterpillar to start looking for. You may want to choose a species of caterpillar that you have ready access to a food source for.  Caterpillars prefer leaves from their “host plant” to eat. Different kinds of caterpillars (and therefore butterflies) prefer to reside in different kinds of plants, so It’s important that you choose what kind of caterpillar you’re looking for in order to know where to look.  The plant a breed of butterfly prefers is called a “host plant.”  Some examples of host plants for certain species of caterpillar are:  Monarch butterfly caterpillars prefer milkweed plants. Spicebush Swallowtail caterpillars tend to reside in spicebush. Your best bet to find a Zebra Swallowtail caterpillar is in a Paw-Paw plant. Black Swallowtail caterpillars are commonly found in parsley, dill, or fennel plants. Luna moth caterpillars can be found in both walnut and sweet gum plants. Cecropia Moth, Viceroy or...

How would you rephrase that briefly using Chinese?
了解本地毛虫。 决定你要寻找的毛虫品种。 研究你家后院或所在地区的植物。 在春天开始寻找毛虫。 寻找毛虫啃食的痕迹。 让毛虫爬向你。