Ralph Pace / Humpback Whale (Megaptera novaeangliae) pair gulp feeding, Morris Reef, Alaska

Ralph Pace / Tourists and calving glacier, South Sawyer Glacier, Alaska

Ralph Pace / Giant Kelp (Macrocystis pyrifera), Monterey Bay, California

Ralph Pace / Giant Kelp (Macrocystis pyrifera), Monterey Bay, California

Ralph Pace / Florida Gopher Tortoise (Gopherus polyphemus), Disney Wilderness Preserve, Florida

Ralph Pace / River in The Apalachicola Bluffs and Ravines Preserve, managed by TNC, Florida

Ralph Pace / Bigeye Trevally (Caranx sexfasciatus) school, Cabo Pulmo National Park, Baja California, Mexico

Ralph Pace / Manta Ray (Manta birostris), Baja California, Mexico

Ralph Pace / Bottlenose Dolphin (Tursiops truncatus) and diver, Revillagigedo Islands, Mexico

Ralph Pace / Green Sea Turtle (Chelonia mydas), San Diego, California

Ralph Pace / Tiger Shark (Galeocerdo cuvieri), Maui, Hawaii

Ralph Pace / Short-tail Nurse Shark (Ginglymostoma cirratum), Saint Eustatius, Caribbean