LYNN M. STONE / Mixed-breed piglet in straw, Maple Park, Illinois, USA

LYNN M. STONE / Mixed-breed piglet in wooden box with sunflowers, Maple Park, Illinois, USA

LYNN M. STONE / Sleeping mixed-breed piglet in straw, Maple Park, Illinois, USA

Rolf Nussbaumer / Jumping Spider (Salticidae) perched on Bigtooth Maple leaf (Acer grandidentatum). Lost Maples State Park, Hill Country, Central Texas, USA, November.

Laurie Campbell / Norway Maple (Acer platanoides) fallen leaves in autumn, Queen Elizabeth Forest Park, Stirlingshire, Scotland, October

Jack Dykinga / Blue Hen Falls with Sugar Maples (Acer saccharum) and American Beech trees (Fagus grandifolia), Cuyahoga Valley National Park, Ohio

Tim Fitzharris / Little Pigeon River cascading among rocks and colorful Maple leaves, Great Smoky Mountains National Park, Tennessee

George Sanker / Red Maple Tree (Acer rubrum) in autumn colours. Baxter State Park, Maine, September.

Floris van Breugel / Moss-covered Vine maples (Acer circinatum) in the Hoh River Rainforest of Olympic National Park, Washington, USA, May.

Floris van Breugel / Moss-covered Vine maples (Acer circinatum) and Big leaf maples (Acer macrophyllum) in the Hoh River Rainforest of Olympic National Park, Washington, USA, May.

Floris van Breugel / Maple tree covered with moss and lichen in drizzly fog along the Hoh River in Olympic National Park, Washington, February.

Ben Lascelles / Autumn / fall colours of maple (Acer sp) trees, Hardwood lookout trail, Algonquin Provincial Park, Ontario, Canada. Oct 2009

Ben Lascelles / Autumn / fall colours of the maple (Acer sp). trees, Hardwood lookout trail, Algonquin Provincial Park, Ontario, Canada. Oct 2009

Ben Lascelles / Autumn / fall colours of maple (Acer sp) trees, Hardwood lookout trail, Algonquin Provincial Park, Ontario, Canada. October 2009

Jack Dykinga / Big leaf maple trees drapped in moss, wood ferns and sword ferns in the temperate rain forest of the Hoh, Olympic National Park, Washington, USA

Jack Dykinga / Big leaf maple trees drapped in moss, wood ferns and sword ferns in the temperate rain forest of the Hoh, Olympic National Park, Washington, USA

Konstantin Mikhailov / View to Mt.Logan Ridge in low clouds from the Maple-Loop Trail in Rainy Pass area of North Cascades National Park, Cascade Range, Washington, USA, October 2009.

Konstantin Mikhailov / The spectacular Loop-Maple Trail heading up from Rainy Pass area of North Cascades Scenic Highway, above the tree line, with the islets of sub alpine fir and larch trees, North Cascades National Park...

Konstantin Mikhailov / The spectacular Loop-Maple Trail heading up from Rainy Pass area of North Cascades Scenic Highway, above the tree line, with the islets of sub alpine firs and larches, North Cascades National Park Cas...

Konstantin Mikhailov / The rocky highlands of North Cascades Range above the tree line in clouds on Maple-Loop Trail in Rainy Pass area, North Cascades National Park, Cascade Range, Washington, October 2009.

Konstantin Mikhailov / View to Mt.Logan Ridge in low clouds from the Maple-Loop Trail in Rainy Pass area of North Cascades National Park, Cascade Range, Washington, USA, October 2009.

Konstantin Mikhailov / View to Mt.Logan Ridge in low clouds from the Maple-Loop Trail in Rainy Pass area of North Cascades National Park, Cascade Range, Washington, USA, October 2009.

Konstantin Mikhailov / The Loop-Maple Trail heading up from Rainy Pass area of North Cascades Scenic Highway, above the tree line, with the islets of sub alpine firs and larches, North Cascades National Park Cascade Range,...

Konstantin Mikhailov / The rocky highlands of North Cascades Range above the tree line in clouds, on Maple-Loop Trail in Rainy Pass area, North Cascades National Park, Cascade Range, Washington, October 2009.

Gerrit Vyn / Fall Vine maple and boulders, Mount Rainier National Park, Washington, USA October 2011

LYNN M. STONE / Mixed-breed piglet in basket in straw, Maple Park, Illinois, USA

Matthias Breiter / Sugar Maple (Acer saccharum) seed pods, Spruce Woods Provincial Park, Manitoba, Canada

Scott Leslie / Red Maple (Acer rubrum) in autumn foliage reflected in Mersey River, Kejimkujik National Park, Nova Scotia, Canada

Rolf Nussbaumer / Bigtooth Maple (Acer saccharum grandidentatum) shifting into autumn colours. Lost Maples State Park, Hill Country, Central Texas, USA, November.

Rolf Nussbaumer / Red Admiral butterfly (Vanessa atalanta), perched on Bigtooth Maple (Acer grandidentatum), Lost Maples State Park, Hill Country, Central Texas, USA, November.

Rolf Nussbaumer / Acorn Weevil (Curculio glandium) perched on Bigtooth Maple (Acer grandidentatum) leaf. Lost Maples State Park, Texas, USA, November.

Yva Momatiuk & John Eastcott / Maple (Acer sp) and Cottonwood (Populus sp) trees in fall colors, Zion National Park, Utah

Eric Baccega / Autumn reflections on Modene Lake and forest. La Mauricie National Park, Quebec, Canada, October 2010

Eric Baccega / Autumn reflections on Modene Lake and forest. La Mauricie National Park, Quebec, Canada, October 2010

Eric Baccega / Autumn colour on Modene lake. La Mauricie National Park, Quebec, Canada, October 2010

Eric Baccega / Aerial view of autumn colour in forest, New Brunswick, Canada, October 2010

Eric Baccega / Mist and autumn coloured tress in Modene lake. La Mauricie National Park, Quebec, Canada

Floris van Breugel / A lone Maple leaf (Acer) accents the sandy forms created by flow separation after autumn rains, Zion National Park, Utah, USA

Floris van Breugel / Maple trees (Acer) under a thick coating of the abundant mosses. In summer this climate is so moist the biomass density competes with that of true rainforests. Olympic National Park, Washington, USA,...

Gerrit Vyn / Bigleaf maple tree (Acer macrophyllum) covered in moss, and Sword Ferns in the Hoh Rainforest. Olympic National Park, Washington, USA, March 2010.

Gerrit Vyn / Bigleaf maple trees (Acer macropyllum) covered in moss, in the Hoh Rainforest. Olympic National Park, Washington, USA, March 2010.

Jim Brandenburg / Maple (Acer sp) trees in autumn color, Snowbank Lake, Boundary Waters Canoe Area Wilderness, Superior National Forest, Minnesota.

Kevin Schafer / Bigleaf Maple (Acer macrophyllum) covered with moss and ferns, Hoh River Valley, Olympic National Park, Washington

Kevin Schafer / Bigleaf Maple (Acer macrophyllum) over Lake Crescent, Olympic National Park, Washington

LYNN M. STONE / Domestic dog, Yellow Labrador Retriever puppy lying amongst pink Peony flowers, Maple Park, Illinois, USA

LYNN M. STONE / Domestic dog, Yellow Labrador Retriever puppy resting amongst pink Peony flowers, Maple Park, Illinois, USA

LYNN M. STONE / Domestic dog, Yellow Labrador Retriever puppy amongst pink Peony flowers, Maple Park, Illinois, USA

LYNN M. STONE / Domestic dog, Yellow Labrador Retriever puppy amongst pink Peony flowers, Maple Park, Illinois, USA

Wild Wonders of Europe / Dörr / Maple tree (Acer) with yellow leaves in autumn, Valea Crapaturii, NP Piatra Craiului, Transylvania, Southern Carpathian Mountains, Romania, October 2008

Scott Leslie / Sugar Maple (Acer saccharum) forest and trail, Cape Breton Highlands National Park, Nova Scotia, Canada

Scott Leslie / Paper Birch (Betula papyrifera) and Sugar Maple (Acer saccharum) saplings, Cape Breton Highlands National Park, Nova Scotia, Canada

Konrad Wothe / Hall of Mosses hiking trail through Bigleaf Maples (Acer macrophyllum) and Sitka Spruces (Picea sitchensis), Hoh Rainforest, Olympic National Park, Washington

Konrad Wothe / Bigleaf Maple (Acer macrophyllum) and Sitka Spruce (Picea sitchensis) trees along Hall of Mosses hiking trail, Hoh Rainforest, Olympic National Park, Washington

Jerry Monkman / Lichens, Tree lungwort {Lobaria pulmonaria} (green) and {Anzia colpodes} on a maple tree, Acadia National Park, Maine, USA

Thomas Lazar / Upland Sugar Maple (Acer saccharum) forest in autumn, Porcupine Mountains State Park, Upper Peninsula, Michigan, USA

Thomas Lazar / Sugar Maple (Acer saccharum) and Pine trees in autumn, Porcupine Mountains State Park, Upper Peninsula, Michigan, USA

Jack Dykinga / Sugar Maple (Acer saccharum) and American Beech leaves (Fagus grandifolia) on a small waterfall above Blue Hen Falls in Cuyahoga Valley National Park, Ohio

Jack Dykinga / Sugar Maple (Acer saccharum) and American Beech leaves (Fagus grandifolia) on a small waterfall above Blue Hen Falls in Cuyahoga Valley National Park, Ohio

Scott Leslie / Maple (Acer sp) seeds emerging, Kejimkujik National Park, Nova Scotia, Canada

Rolf Nussbaumer / Yellow Wagtail {Motacilla flava} male, National Park Lake Neusiedl, Austria, April

Rolf Nussbaumer / Bigtooth Maples (Acer saccharum grandidentatum) in autumn, McKittrick Canyon, Guadalupe Mountains National Park, Texas, USA, November 2005

Rolf Nussbaumer / Texas Alligator Lizard {Gerrhonotus infernalis} amongst leaf litter of Bigtooth Maple (Acer grandidentatum) Lost Maples State Park, Texas, USA

Rolf Nussbaumer / Stream with fallen leaves of Bigtooth Maple (Acer grandidentatum) in autumn, McKittrick Canyon, Guadalupe Mountains National Park, Texas, USA, November 2005

David Noton / Autumn colours, sugar maple, Cape Breton Highlands National Park, Nova Scotia, Canada

Kirkendall-Spring / Maple tree in autumn colour, Washington Park Arboretum, Seattle, Washington, USA

Tim Edwards / Sun shining through Vine Maple (Acer circinatum) leaves, Olympic NP, Washington, USA

Tim Fitzharris / Maple (Acer sp) trees in autumn, Great Smoky Mountains National Park, Tennessee

Tim Fitzharris / Maple (Acer sp) and Cottonwood (Populus sp) trees in autumn, Zion National Park, Utah

Tim Fitzharris / Maple (Acer sp) and Cottonwood (Populus sp) autumn foliage, Zion National Park, Utah

Tim Fitzharris / Maple (Acer sp) glade, Quinault Rain Forest, Olympic National Park, Washington

Tim Fitzharris / Maple (Acer sp) glade, Quinault Rain Forest, Olympic National Park, Washington

Tim Fitzharris / Maple (Acer sp) glade, Quinault Rain Forest, Olympic National Park, Washington

Tim Fitzharris / Maple (Acer sp) glade, Quinault Temperate Rainforest, Olympic National Park, Washington

Yva Momatiuk & John Eastcott / Sugar Maple (Acer saccharum) grove in autumn, Montgomery Place Historical Park, New York

Tim Fitzharris / Fall-colored Maple, Sourwood and Cherry leaves on ground, Great Smoky Mountains National Park, Tennessee

Gerry Ellis / Spring vine Maple leaves over Still Creek, temperate rainforest, Mt Hood National Forest, Oregon

Yva Momatiuk & John Eastcott / Sugar Maple (Acer saccharum) and Beech leaves in autumn color, Baxter State Park, Maine

Tim Fitzharris / Little Pigeon River, cascading among rocks and colorful fall Maple leaves, Great Smoky Mountains National Park, Tennessee

Gerry Ellis / Red Alder (Alnus rubra) and Vine Maple (Acer circinatum) reflection in quiet waters of Upper Necanicum River, Tillamook State Forest, Oregon

Tim Fitzharris / Little Pigeon River, cascading among rocks and colorful fall Maple leaves, Great Smoky Mountains National Park, Tennessee

Tim Fitzharris / Birch (Betula sp) trunk and maple leaves, Pictured Rocks National Lakeshore, Michigan

Jim Brandenburg / Sugar Maple (Acer saccharum) trees in autumn colors, Vermilion Falls, Voyager National Park, Minnesota

Jim Brandenburg / Pine (Pinus sp) trees, towering over young Maple (Acer sp) trees, North Arm Trail, Superior National Forest, Minnesota

Scott Leslie / Red Maple (Acer rubrum) in autumn foliage reflected in Mersey River, Kejimkujik National Park, Nova Scotia, Canada