COLDWATERS C I E N C EA journal of marine life
& ocean exploration
MARINE LIFE / OCEAN SCIENCE / EXPLORATION
Strange bodies. Remarkable adaptations.
Meet the life that makes our ocean extraordinary.
SHARKS / WHALES / TURTLES / MORE
Wildlife photographSharks
White sharks are large, streamlined predators whose size, tooth shape and sensory systems help distinguish them from similar sharks. Juvenile habitat research documented a northward range change, while leaving individual causes and total population numbers unresolved.
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Wildlife photographWhales
Blue whales are baleen whales whose size is sustained by krill-rich feeding patches. Their expandable throat pleats take in prey-bearing water, while baleen retains food as water drains. Tracking off California shows feeding effort changes with prey density and dive constraints.
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Wildlife photographDolphins and porpoises
Common bottlenose dolphins use sound, flexible social groups, and locally varied feeding tactics across coastal and offshore habitats. Their familiar shape does not reveal a single population or behavior, and global species labels cannot substitute for local stock evidence.
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Pastel natural-history artSea turtles
Green sea turtles change what they eat as they grow: oceanic young take animal and plant material around floating communities, while many older juveniles and adults graze coastal algae and seagrass. Their anatomy, habitat, and scute pattern help distinguish them, with regional variation requiring care.
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Watercolor and gouacheOtters and coastal mammals
Sea otters stay warm through a groomed, air-trapping coat rather than a thick blubber layer. That insulation depends on clean fur and frequent care, while a high metabolic rate drives substantial food needs and makes undisturbed rest energetically useful.
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Underwater digital illustrationRays and reef fish
Giant manta rays feed by channeling plankton-rich water through the mouth and across gill filters, while their ventral patterns can help researchers recognize individuals. A 2025 species description also means some historical Atlantic identifications need rechecking.
Explore the animal →A CLOSER LOOK
Some drift, some pulse, some filter the water around them. Discover six groups with very different ways of living in the sea.
01Eight rows of cilia propel these delicate, often transparent predators.
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02From tiny medusae to branching colonies: a remarkably varied class.
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03Swimming snails with a foot transformed into wing-like lobes.
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04Many connected zooids share the work of a single colony.
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05A pulsing bell, trailing tentacles and a surprisingly complex life cycle.
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06Sea squirts, salps and larvaceans share a chordate connection.
Explore group →Organism plates are simplified explanatory illustrations; features and proportions vary among species.
FROM PUBLIC DATA TO A CHECKABLE RESULT
Compare October 2025 NOAA water temperatures at Monterey and La Jolla. Inspect the station context, calculations and the missing reading, then download the data.
Explore the NOAA data case →Follow a curated topic guide →
QUESTIONS FROM THE SHORE AND THE DEEP
Glow and coastal conditions
Ocean glow is often bioluminescence: light produced by chemistry inside living organisms. Microscopic plankton can flash when disturbed, while other animals use light to lure prey, communicate, or hide. The same visible blue glow can arise from different species and functions.
Beach discoveries
A useful shell chart starts with body plan and structure, then narrows likely groups by hinge, plates, spire, aperture, canal, and ornament. Regional keys can guide a tentative identification, but wear, geography, and collection rules limit certainty.
Deep-sea animals
A 2020 survey of two Western Australian submarine canyons found Architeuthis dux DNA in six samples. That is evidence of genetic material in collected seawater, not a sighting or count of squid; interpreting it depends on sampling design, reference sequences and how DNA moves.
Gelatinous and unusual animals
Lampocteis cruentiventer is a ctenophore whose comb rows propel it and shimmer under illumination. Its red stomach can conceal luminous prey in deep water, although the detailed diet remains unknown. Depth and size figures differ between institutional accounts, so treat them as reported ranges.
Octopus behavior
A coconut octopus can move backward on two arms while curling six around its body. The arms roll against the seabed rather than bending at knees. Shell transport is a separate, cumbersome behavior whose later protective use matters to tool-use discussions.
Learning and careers
Ocean citizen science includes classifying remote images and documenting organisms you observe yourself. Choose a project by its current workflow, learn its rules, and submit observations with accurate evidence. Treat platform grades and location settings as useful controls with defined limits.
FROM THE RESEARCH DESK
Discovery / 2020
High-definition underwater video can document anatomy and behavior when collecting a delicate animal is impractical. A video-based species description is a specific evidence case, with clear strengths and limits.
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Discovery / 2024
Bathydevius caudactylus shows how long-term observation and careful anatomical comparison can reveal an unfamiliar animal’s place in the deep sea.
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Research tools / 2020
Laser imaging can reveal how a giant larvacean’s delicate mucus filters shape water and particle flow, while leaving open questions about where discarded material ultimately goes.
Read the science →FOLLOW THE LIGHT
Sunlight fades with depth. Follow it downward to see how the environment changes.
In roughly the upper 200 metres, enough sunlight can penetrate to support photosynthesis. Clarity, season and location change how far light reaches.
Approximate light zones. This is an educational guide, not a live ocean profile.
TAKE A NOTE. ASK A QUESTION.
Learn to record temperatures, read a photograph and put an observation in context.
Open the field library →