Bird images (in order of contribution):

• 
  Barred Owl
• 
  Northern Hawk Owl
• 
  Tree Swallow
• 
  Chukar
• 
  Great Egret
• 
  Prothonotary Warbler
• 
  Eastern Kingbird
• 
  Blackburnian Warbler
• 
  Chestnut-sided Warbler (female)
• 
  Pied-billed Grebe
• 
  Boreal Owl
• 
  Black-crowned Night Heron
• 
  Double-crested Cormorant
• 
  Spotted Sandpiper (side)
• 
  Spotted Sandpiper (front)
• 
  Barn Swallow (North American)
• 
  Ring-billed Gull (weeks old)
• 
  Ring-billed Gull (weeks old)
• 
  Yellow-billed Cuckoo
• 
  Common Grackle
• 
  Song Sparrow
• 
  American Goldfinch
• 
  Northern Mockingbird
• 
  American Pipit
• 
  Gray Jay
• 
  Dark-eyed Junco
• 
  American Tree Sparrow
• 
  Semipalmated Plover
• 
  Red-necked Grebe
• 
  Fox Sparrow
• 
  Clay-colored Robin
• 
  Willet
• 
  American Black Vulture
• 
  Sanderling
• 
  White-breasted Nuthatch
• 
  Black-capped Chickadee
• 
  Hairy Woodpecker
• 
  Iceland Gull
• 
  Short-eared Owl
• 
  American Coot
• 
  Bufflehead (male)
• 
  Bufflehead (female)
• 
  Ring-necked Duck (male)
• 
  Brown Creeper
• 
  Dunlin
• 
  Least Flycatcher
• 
  Red-Winged Blackbird (female)
• 
  Black-chinned Hummingbird (male)
• 
  Black-chinned Hummingbird (female)
• 
  Anna's Hummingbird (male)
• 
  Semipalmated Sandpiper
• 
  Spruce Grouse (female)
• 
  Cooper's Hawk

Mammals:

• 
  Hopi Chipmunk

Miscellaneous:

• 
  Moon
• 
  Canyoneering
• 
  Green River (Utah)

Graphics:

• 
  Pincushion distortion
• 
  Barrel distortion
• 
  Spherical aberration (focal plane)
• 
  Spherical aberration (longitudinal)
• 
  Photon noise
• 
  Gamut (not in main article yet)
• 
  Solar System
• 
  Solar System (no labels)

Map Projections:

• 
  Goode homolosine projection
• 
  Universal Transverse Mercator coordinate system
• GEOREF (global)
  GEOREF (global)
• 
  GEOREF (local)
• 
  Winkel Tripel projection
• 
  van der Grinten projection
• 
  Gall-Peters projection

Audio (birds):

Song Sparrow

Typical call sequence.

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Chipping Sparrow

Typical calls.

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Audio (frogs):

Spring Peeper (one)

A lone Spring Peeper.

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Spring Peeper (many)

A pond full of Spring Peepers.

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Audio (misc):

Mdf's Featured Picture Gallery.