Atmospheric
Airglow (atmospheric chemiluminescence)
Biological
Alaska Snow Geese Spring Blastoff
Biological
Alkali (Brine) Fly Shoreline Swarms
Celestial
Alpha Capricornids
Botanical
Amazon Giant Water Lily Bloom
Biological
Año Nuevo Elephant Seal Pupping
Botanical
Anza-Borrego Desert Superbloom
Geological
Apostle Islands Ice Caves
Botanical
Appalachian Foxfire (Bioluminescent Fungi)
Meteorological
Asperitas Clouds
Celestial
Aurora Borealis (Northern Lights)
Botanical
Autumn Foliage Peak - New England
Wildlife
Bald Eagle Congregation - Chilkat River
Wildlife
Bat Emergence - Bracken Cave
Wildlife
Bat Exodus
Atmospheric
Belt of Venus and Earth's Shadow
Celestial
Beta Taurid Daylight Fireballs
Wildlife
Bison Rut - Yellowstone
Wildlife
Blackwater Snow Goose & Tundra Swan Winter Spectacle
Geological
Bonneville Salt Flats mirror effect
Biological
Bosque del Apache Sandhill Crane Blast-off
Wildlife
Boxley Valley Elk Rut
Wildlife
Brown Bear Salmon Feast - Katmai
Astronomical
Bruneau Dunes Dark-Sky Dune
Marine
California Dolphin Superpod (Monterey Bay)
Botanical
California Superbloom
Marine
Cape Cod Bay Right Whale Spring Aggregation
Marine
Cape Cod Great White Shark Seal Predation
Wildlife
Cape May Monarch Butterfly Roosting
Biological
Cape May Raptor Fall Migration
Wildlife
Carlsbad Caverns Bat Flight
Botanical
Carlsbad Ranunculus Flower Fields
Marine
Channel Islands blue whale feeding aggregation
Wildlife
Chincoteague Wild Pony Swim (Pony Penning)
Atmospheric
Circumzenithal arc
Marine
Coastal Bioluminescent Red Tide (San Diego)
Biological
Columbia River Eulachon (Candlefish) Run
Wildlife
Comanche Grassland Tarantula Walkabout
Biological
Congaree Synchronous Fireflies
Biological
Congress Avenue Bridge Bat Emergence
Atmospheric
Crepuscular and Anticrepuscular Rays
Marine
Crystal River Manatee Gathering
Wildlife
Custer State Park Buffalo Roundup
Wildlife
Dauphin Island Spring Migratory Bird Fallout
Biological
Delaware Bay Red Knot and Horseshoe Crab Spawn
Wildlife
Dismalites (Orfelia fultoni) bioluminescence
Celestial
Draconid Meteor Shower
Wildlife
Elk Rut - Rocky Mountains
Wildlife
Ephemeral Pool Resurrection Life
Wildlife
Everglades alligator courtship bellowing
Marine
Farallon Islands Great White Shark Aggregation
Geological
Flint Hills Tallgrass Prairie Burn Season
Marine
Florida Keys coral mass spawning
Marine
Flower Garden Banks Coral Mass Spawning
Geological
Fly Geyser
Atmospheric
Fogbow (White Rainbow)
Marine
Frederick Sound Humpback Bubble-Net Feeding
Wildlife
Freezout Lake Snow Goose Migration (Blastoff)
Geological
Frost quake (cryoseism)
Botanical
Ghost Orchid Bloom
Marine
Glass Eel (Elver) Spring Run — Maine, USA
Marine
Goliath Grouper Spawning Aggregations (Jupiter, Florida)
Atmospheric
Grand Canyon Total Cloud Inversion
Wildlife
Grand Isle Spring Migratory Bird Fallout
Geological
Grand Prismatic Spring (Midway Geyser Basin)
Wildlife
Grandfather Mountain Blue Ghost & Synchronous Fireflies
Marine
Gray Whale Migration
Geological
Great Lakes Ice Volcanoes
Wildlife
Great Salt Lake Phalarope Staging
Botanical
Great Salt Lake Pink Algae Bloom
Wildlife
Greater Prairie-Chicken Booming Grounds (Kansas)
Geological
Green Sand Beaches
Marine
Grunion Runs
Marine
Hawaiian spinner dolphin dawn congregation
Wildlife
Hawk Mountain Autumn Raptor Migration
Marine
Horseshoe Crab Spawning
Atmospheric
Horsetail Fall Firefall (Yosemite)
Geological
Horsetail Firefall
Wildlife
Humpback Whale Breach - Pacific
Geological
Ice shove (ice surge / ice tsunami)
Marine
Indian River Lagoon Bioluminescence
Wildlife
Jasper-Pulaski Sandhill Crane Staging
Geological
Kelso Dunes Booming Sand
Atmospheric
Kelvin-Helmholtz wave clouds
Volcanic
Kīlauea Episodic Lava Fountaining
Geological
Kilauea Lava Flows
Marine
Kona Manta Ray Night Dive
Wildlife
Lake Erie Mayfly Hatch
Wildlife
Lake Mattamuskeet Tundra Swan & Snow Goose Winter Congregation
Biological
Lake Murray Purple Martin Mega-Roost
Biological
Lake Winnebago Lake Fly Hatch
Biological
Laysan Albatross Courtship Dance (Midway Atoll)
Wildlife
Loess Bluffs Snow Goose Migration
Celestial
Lyrid Meteor Shower
Atmospheric
Mammatus clouds (post-severe-storm mamma)
Wildlife
Mammoth Cave Bat Emergence
Wildlife
Manatee Aggregation - Florida Springs
Celestial
Manhattanhenge (sunset street alignment)
Biological
Manta Ray Feeding Frenzy
Atmospheric
Marfa Mystery Lights
Geological
Matanuska Glacier blue ice caves
Marine
Maui Humpback Whale Competitive Pods
Biological
Mayfly Emergence
Biological
McNeil River Brown Bear Falls Concentration
Geological
Medano Creek Surge
Geological
Mendenhall Glacier Ice Caves
Wildlife
Mississippi Sandhill Crane
Geological
Mono Lake Tufa Towers
Marine
Monterey Bay Market Squid Spawn and Egg Beds
Marine
Monterey Bay Sea Sparkle Bioluminescence
Atmospheric
Moonbow at Cumberland Falls
Biological
Mormon Cricket Migrations
Botanical
Mount Rainier Subalpine Wildflower Meadows
Atmospheric
Mount Shasta lenticular cloud stacks
Atmospheric
Nacreous Clouds (Polar Stratospheric)
Atmospheric
Niagara Falls Moonbow
Marine
North Atlantic Right Whale Calving Ground
Celestial
Northern Taurids Fireball Season
Marine
Old Sow Whirlpool
Botanical
Painted Hills wildflower bloom
Biological
Painted Lady Butterfly Migration
Wildlife
Periodical Cicada Brood II Emergence
Biological
Periodical Cicada Brood V Mass Emergence
Biological
Periodical Cicada Brood XIV Mass Emergence
Wildlife
Periodical Cicada Brood XIX Emergence (Tennessee)
Biological
Periodical Cicada, Brood XIII (Illinois emergence)
Celestial
Perseid Meteor Shower
Marine
Piedras Blancas Elephant Seal Molt
Biological
Pinnacles California Condor Fledging Window
Biological
Pismo Beach Monarch Overwintering Groves
Meteorological
Plant Frost-Ribbons (Crystallofolia)
Wildlife
Point Reyes Ladybug Winter Aggregations
Biological
Porcupine Caribou Herd Spring Migration and Calving
Geological
Presumpscot River Rotating Ice Disk
Botanical
Rainbow Eucalyptus Bark Peeling
Atmospheric
Red Sprites (Upper-Atmosphere Lightning)
Wildlife
Rocky Mountain Bighorn Sheep Rut (Colorado)
Botanical
Rocky Shoals Spider Lily Bloom
Wildlife
Roosevelt elk rut - Hoh Rainforest, Olympic National Park
Biological
Sage Grouse Lekking
Botanical
Saguaro Cactus Mass Bloom
Geological
Sailing Stones (Racetrack Playa)
Biological
Salmon Run - Bristol Bay
Wildlife
Salmonfly Hatch (Madison River)
Biological
San Juan Capistrano Swallows Return
Biological
Sandhill Crane Migration - Platte River
Marine
Santa Cruz Bioluminescent Red Tide Waves
Biological
Sea Turtle Nesting - Florida
Meteorological
Shelf Cloud (Arcus)
Marine
Sitka Sound Herring Spawn
Biological
Skagit River Bald Eagle Concentration
Wildlife
Skagit Valley Snow Goose Blastoff
Biological
Snow Goose Migration - Bosque del Apache
Atmospheric
Sonoran Haboob Dust Storms
Celestial
Southern Taurids Fireball Season
Meteorological
Supercell Thunderstorm Structure (Mesocyclone)
Wildlife
Synchronous Fireflies (Great Smoky Mountains)
Biological
Tarantula Migration
Botanical
Texas bluebonnet superbloom
Geological
Thor's Well: King Tide Eruptions
Botanical
Tohono Chul Night-Blooming Cereus Mass Bloom
Celestial
Total Solar Eclipse 2033 (Alaska)
Geological
Transient Cloudburst Waterfalls
Wildlife
Tule Elk Rut at Point Reyes
Marine
Turnagain Arm Bore Tide
Geological
Upper Antelope Canyon Sunbeam Season
Celestial
Ursid Meteor Shower
Biological
Vermont Spotted Salamander Big Night
Biological
Walrus Haul-out
Botanical
Watermelon Snow (algal bloom)
Meteorological
Waterspouts
Wildlife
Watoga State Park Synchronous Fireflies
Wildlife
Wichita Mountains Bison Calving Season
Wildlife
Yellowstone winter wolf-bison predation (Lamar Valley)
Atmospheric