More Reproduction

"Devoted Dads" spread from Citizens of the Sea by Nancy Knowlton.
The Laysan albatross ( Phoebastria immutabilis ) breeds mainly in Hawaii and other Pacific islands where male and female pairs will incubate their egg for nine weeks. The pair participates in an...
Killer whales ( Orcinus orca ) have something in common with humans: early menopause. Read Smithsonian marine scientist Nancy Knowlton's blog post to find out more.
Two California market squids ( Loligo opalescens ) mate in the waters off of California's Channel Islands. While spawning, the male's arms blush red as he embraces the female, a warning to other...
Seahorse couples, such as this pair of thorny seahorses ( Hippocampus histrix ) , greet each other every morning with a unique dance that sometimes involves changing color. The couple promenades and...
by Emily Frost CREDIT: Kevin Rolle Albatrosses Get ‘Romantic’ to Increase Chick Survival Albatross relationships seem especially relatable to humans. These long-lived and highly-endangered birds will...
Smaller than the head of a pin, this arrow squid (Doryteuthis plei ) embryo looks like a miniature adult and is almost ready to hatch! Depending on the squid species, the development from a...
Zombie worms don’t crave brains: instead they seek bones. The 1 to 3 inch (2 to 7 centimeter) Osedax worms were first discovered living in the bones of a rotting gray whale on the deep sea floor,...
In marshlands along the coast of the Gulf of Mexico, it's easy to hear the sharp, buzzing calls of seaside sparrows ( Ammodramus maritimus )—even if they can be hard to spot. These five-inch, brown...
The small larvae of elkhorn coral ( Acropora palmata ) settle and grow on the crustose coralline algae species Hydrolithon boergesenii .
“Every four years, sockeyes come inland from the Pacific to spawn. The year 2010 was the largest run in 100 years, reaching more than 30 million fish. On this day, I waited for the right sunlight,...
The Kemp’s ridley is a “riddler” among sea turtles . Although the species was initially recognized in 1880, scientists didn't know where it nested until 80 years later, when a film documenting about...
Corals are sedentery animals, so how do they reproduce? One way is sexually through spawning , when the corals release eggs and sperm into the water (often at the same time due to some sort of...
Coral reefs are some of the most endangered ecosystems on the planet that are home to beautiful wildlife and provide food to many people living on the coast. So how do you protect the reefs without...
Sharks have young in three different ways. After internal fertilization, some species lay a thick egg case that encloses the shark embryo (seen in the photo here). Most species are ovoviviparous,...
Every year, at the same place and time, thousands of female Kemp's ridley sea turtles ( Lepidochelys kempii ) come ashore to nest and lay their eggs on the beach. This mass nesting event is known as...
The corkwing wrasse, or gilt-head, changes color depending on its age, sex, and breeding season. For instance, during the breeding season, males have blue spotted fins and the middle of their scales...
Instead of females, male seahorses carry the developing seahorse embryos in a kangaroo-like pouch. During mating season, the female deposits her eggs into the pouch, and the male fertilizes them...
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