Aflo / Japanese squirrel {Sciurus lis} and Red maple leaves. Japan

Aflo / ic-07905 Small japanese flying squirrel peeping out of hole in tree trunk {Pteromys momonga} Japan.

Aflo / ic-07901 Small japanese flying squirrel peeping out of hole in tree trunk {Pteromys momonga} Japan.

Aflo / ic-07705 Japanese squirrel {Sciurus lis} + Maple leaves, Japan.

Aflo / ic-07704 Japanese squirrel on moss {Sciurus lis} Japan.

Aflo / ic-07703 Japanese squirrel {Sciurus lis} feeding, winter Japan.

Aflo / ic-07702 Japanese squirrel {Sciurus lis} feeding on pine cones, Japan.

Aflo / ic-07701 Japanese squirrel {Sciurus lis} foraging on ground next to Maple leaves, Japan.

Aflo / ic-07605 Japanese squirrel amongst yellow flowers {Sciurus lis} Japan.

Aflo / ic-07604 Japanese squirrel amongst purple flowers {Sciurus lis} Japan.

Aflo / ic-07603 Japanese squirrel feeding on ground {Sciurus lis} Japan.

Aflo / ic-07602 Japanese squirrel on branch with blossom {Sciurus lis} Japan.

Aflo / ic-07601 Japanese squirrel amongst flowers {Sciurus lis} Japan.

Nature Production / Japanese Giant Flying Squirrel {Petaurista leucogenys} gliding, Okutama, Tokyo, Japan, December

Nature Production / Japanese Giant Flying Squirrel {Petaurista leucogenys} feeding on Sawtooth Oak leaves {Quercus acutissima} Japan

Nature Production / Japanese Giant Flying Squirrel {Petaurista leucogenys} in tree, Yamanashi, Japan

Nature Production / Japanese Giant Flying Squirrel {Petaurista leucogenys} gliding, Yamanashi, Japan

Nature Production / Japanese Squirrel {Sciurus lis} sleeping on branch of tree, Tokyo, Japan

Nature Production / Japanese Giant Flying Squirrel {Petaurista leucogenys} feeding on Japanese persimmon fruit at night, Okutama, Tokyo, Japan, December

Nature Production / Japanese Giant Flying Squirrel {Petaurista leucogenys} feeding on Japanese persimmon fruit at night, Okutama, Tokyo, Japan, December

Tony Wu / Japanese red squirrel (Sciurus vulgaris orientis) leaping among branches of fir tree (Abies sp.) while collecting building material for construction of nest in final days of winter. Hokkaido, Japan.

Tony Wu / Japanese red squirrel (Sciurus vulgaris orientis) struggling with long branch collected for construction of nest. Hokkaido, Japan.

Tony Wu / Japanese red squirrel (Sciurus vulgaris orientis) struggling with long branch collected for construction of nest. Hokkaido, Japan.

Tony Wu / Japanese red squirrel (Sciurus vulgaris orientis) breaking off branch for purpose of constructing nest to prepare for upcoming reproductive season. Hokkaido, Japan.

Tony Wu / Japanese red squirrel (Sciurus vulgaris orientis) constructing nest to prepare for upcoming reproductive season. Hokkaido, Japan.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) perched on a small branch, just after a major snowstorm. Hokkaido, Japan. February.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) gliding through forest canopy during light snowfall. Hokkaido, Japan. February.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) gliding through forest canopy during light snowfall. Hokkaido, Japan. February.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) gliding towards its nest in snowy forest. Hokkaido, Japan.February. This image shows the squirrel on its final approach to the nest. The squirrel...

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) in the split second before landing on a tree after gliding in snowy forest. Hokkaido, Japan. February. The Sakhalin fir trees in the background a...

Tony Wu / Siberian flying squirrel (Pteromys volans orii) gliding back to its nest after foraging at the top of 20m tall Japanese elm trees (Ulmus davidiana var. japonica), carrying branch with fresh elm buds b...

Tony Wu / Siberian flying squirrel (Pteromys volans orii) inside nest has brought few sticks of Japanese elm (Ulmus davidiana var. japonica) back at end of foraging to enjoy before going inside. Sensing opportu...

Tony Wu / Siberian flying squirrel (Pteromys volans orii) carrying sticks of Japanese elm (Ulmus davidiana var. japonica) back to nest; enjoying eating one before entering nest. Hokkaido, Japan. February.

Tony Wu / Siberian flying squirrel (Pteromys volans orii) consuming fresh buds of small branch from Japanese elm tree (Ulmus davidiana var. japonica). Hokkaido, Japan. February.

Tony Wu / Siberian flying squirrel (Pteromys volans orii) consuming meal of Japanese elm buds (Ulmus davidiana var. japonica) while perched more than 20m above the ground. Hokkaido, Japan. February.

Tony Wu / Siberian flying squirrel (Pteromys volans orii) carrying small branch of Japanese elm (Ulmus davidiana var. japonica) back to its nest. This branch is take-away meal for enjoyment back home. Hokkaido,...

Tony Wu / Siberian flying squirrel (Pteromys volans orii) perched at top of twenty meter Japanese elm tree (Ulmus davidiana var. japonica) early in morning. Hokkaido, Japan. March.

Tony Wu / Japanese red squirrel (Sciurus vulgaris orientis) eating something found buried under snow. Hokkaido, Japan. March.

Tony Wu / Pair of Japanese dwarf flying squirrels (Pteromys volans orii) shortly before mating (the female is in front). Hokkaido, Japan.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) gliding through snowy forest, Hokkaido, Japan.

Tony Wu / Male Japanese dwarf flying squirrels (Pteromys volans orii) competing for females in breeding season. Hokkaido, Japan.

Tony Wu / Male Japanese dwarf flying squirrel (Pteromys volans orii) gliding through forest canopy in mid-afternoon. Hokkaido, Japan.

Tony Wu / Male Japanese dwarf flying squirrels (Pteromys volans orii) fighting for the right to mate with a female, Hokkaido, Japan. The interloper has been body-slammed off the tree by the resident male.

Tony Wu / Pair of Japanese dwarf flying squirrels (Pteromys volans orii) during the reproductive season, on branch looking down, Hokkaido, Japan. The female is on the left, male right.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) feeding on leaf buds of a Japanese elm (Ulmus davidiana var. japonica) during winter, Hokkaido, Japan.

Tony Wu / Leaf buds of Japanese elm (Ulmus davidiana var. japonica), one of the favored foods of Japanese dwarf flying squirrels (Pteromys volans orii), Hokkaido, Japan.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) gliding through tree canopy after sunset, with moon visible. Hokkaido, Japan.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) gliding through the forest, Hokkaido, Japan.

Tony Wu / Pair of Japanese dwarf flying squirrels (Pteromys volans orii) nesting in tree hollow. Male in front, female peeking out from behind.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) male feeding on Japanese alder (Alnus japonica) flower, perched on tree snag. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) on tree trunk beside nest hole. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) perched on tree snag. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) perched on tree snag after emerging from nest, nest lining material on squirrel's head. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) perched on branch. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) male on branch, active during day due to competing for attention of female in oestrous. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) sitting on branch. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) pair mating on tree trunk. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) pair mating on tree trunk. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) pair mating on tree trunk. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) pair on tree trunk, male in pursuit of female, copulating and female returning to nest. Hokkaido, Japan. March. Digital composite sequence.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) pair mating on tree trunk, female putting up resistance, dislodging male. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) pair, male in pursuit of female in oestrus, female spinning around to indicate she is not ready. Hokkaido, Japan. March. Digital composite sequenc...

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) sitting on tree trunk at night near nest hole. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) pair on tree trunk, female in oestrus in nest hole, male sitting on guard above to fend off approaching males. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii), male attempting ambush attack on other, in competition over female in oestrus. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii), two males in competition during mating season, one feeding startled by other approaching on tree trunk. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii), two males on tree trunk, one leaping on other in ambush during mating season. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) on tree trunk. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) grooming whilst sitting on branch. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) pair mating, crack in tree trunk is entrance to nest hole. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) grasping onto branch at dusk. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) sitting on branch in forest at dusk, after emerging from nest hole. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) male gliding between trees. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) pair on tree trunk at dusk, one peering out of nest, the other perched on branch. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) male in tree. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) male in tree. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) male in tree, portrait. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) male sitting in tree, portrait. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) male sitting in tree, portrait. Hokkaido, Japan. March

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) sitting on tree trunk outside nest hole at dusk. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) emerging from nest hole at dusk. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) peering out of nest hole in tree trunk. Hokkaido, Japan. March.