Marine Animals
The ocean covers approximately 71% of Earth's surface and is home to an enormous diversity of life — from microscopic zooplankton to the Blue whale, the largest animal ever known to have existed. Marine ecosystems include coral reefs, open ocean pelagic zones, kelp forests, mangroves, and the largely unexplored deep sea.
About This Section
Marine animal profiles on FaunaHub cover species from multiple taxonomic groups — including cetaceans (whales, dolphins, porpoises), cartilaginous fish (sharks, rays), bony fish, marine reptiles (sea turtles, marine iguanas), and selected invertebrates such as cephalopods. Each profile addresses habitat range, diet and feeding strategy, social behavior where applicable, and conservation status. Deep-sea species are noted where scientific knowledge is limited by the difficulty of direct observation.
Dolphin
Family Delphinidae — highly social marine mammals (Cetacea).
Shark
Cartilaginous fish — 500+ species in superorder Selachimorpha.
Whale
Cetaceans including the largest animals ever known to have lived.
Seal
Pinnipeds — marine mammals adapted to life in and out of water.
Octopus
Eight-armed cephalopod molluscs known for intelligence and camouflage.
Squid
Fast-swimming cephalopods — a group-level overview of order Teuthida.
Crab
True crabs (Brachyura) — ten-legged crustaceans with a broad shell.
Lobster
Clawed seabed crustaceans, using the American lobster as a reference.
Jellyfish
Soft-bodied drifting cnidarians with stinging tentacles.
Sea Turtle
Ancient ocean reptiles — seven species, several of them threatened.
Starfish
Sea stars (Asteroidea) — five-armed echinoderms of the seabed.
Clownfish
Reef anemonefish — see the Fish encyclopedia for more ocean fish.
Seahorse
Upright reef fish where the male carries the young.
Ray
Flattened cartilaginous fish related to sharks.
Fish Encyclopedia
Salmon, tuna, eels, pufferfish, and aquarium fish — the full fish category.
Animal Encyclopedia
Browse all animal categories including mammals, birds, reptiles, and insects.
Marine Conservation Context
Many marine species face significant conservation pressures including overfishing, bycatch, habitat destruction, ocean warming, acidification from increased atmospheric CO2, and plastic pollution. Conservation status information in these profiles is drawn from the IUCN Red List. Where a species' status is listed as Data Deficient or Not Evaluated, this is clearly stated rather than an estimate provided.