Cacti are flowering plants with green, fleshy stems which have a waxy coat to retain water. They have spines, as opposed to leaves, and some have glochids, which are tiny barbed bristles. Grand Canyon cacti most commonly have flowers of red, purple or yellow. The majority grow in the inner canyon, although several species are found on the rim. Some of the common catus species found in the park are the California barrel, fishhook, beavertail, desert prickly pear, claretcup hedgehog, Englemann hedgehog, and whipple cholla.
Maine ocean islands provide the only nesting sites for Atlantic puffins in the United States. Eastern Egg Rock in the midcoast region, Seal Island and Matinicus Rock at the mouth of Penobscot Bay, and Machias Seal Island and Petit Manan Island off the downeast coast provide habitat for more than 4,000 puffins each summer.