I've gotten a few books on wildlife-friendly gardening and have implemented the suggestions with much success. However, the books hardly mention toads at all. I know I have at least one toad that roams around my garden, but I want to make a more suitable environment to attract more. I live in the Upper Peninsula of Michigan so Bufo Americanus is the one I'm trying to attract. Any suggestions, no matter how small, are appreciated

It has always been my impression, having had two older sisters and one younger, that females had no problem attracting toads.

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I don't know why you would want to attract toads (I personally find them repulsive), but you may find this helpful:
http://www.toadilytoads.com/gardentoads.html