Jellyfish
Some jellyfish can release up to this many eggs in a single night.
What is 45,000?
Sea anemones belong to this phylum, which also includes jellyfish and corals.
What is Cnidaria?
This type of animal is what seahorses are classified as.
What are fish?
This term describes the group of animals that includes squid, octopus, and cuttlefish, meaning “head foot.”
What are cephalopods?
These animals are the largest to have ever lived on Earth.
What are blue whales?
This is the name of the simple nervous system that jellyfish have instead of a brain.
What is a neural net?
These flower-like structures surround the mouth of a sea anemone and help it catch food.
What are tentacles?
Unlike most animals, this gender of seahorse carries the eggs and gives birth.
What is the male?
Squid move through the water using this method, pushing water out through a siphon.
What is jet propulsion?
Blue whales primarily eat this tiny shrimp-like organism.
What is krill?
This rare biological process allows the “immortal jellyfish” to transform its cells and return to an earlier life stage.
What is transdifferentiation?
These microscopic stinging structures are used by sea anemones to capture and paralyze prey.
What are nematocysts?
Seahorses lack this organ, which is why they must eat almost constantly.
What is a stomach?
This defense strategy involves releasing a dark cloud to confuse predators or hide movement.
What is squirting ink?
Gray whales travel about this many miles during their yearly migration.
What is about 12,000 miles?
Unlike most jellyfish that follow a one-way life cycle, this species can reverse from a medusa back into this earlier life stage after stress or injury.
What is the immortal jellyfish?
This mutual relationship involves a hermit crab carrying a sea anemone on its shell for protection, while the anemone gains mobility and food access.
What is a symbiotic relationship?
This is the approximate success rate of seahorses when hunting prey.
What is over 90%?
These pigment-filled cells allow squid to rapidly change color for camouflage and communication.
What are chromatophores?
This physical feature is missing on gray whales, helping identify them.
What is a dorsal fin?
The species T. dohrnii (the immortal jellyfish) was first described by scientists in what year?
What is 1883?
Sea anemones are most commonly attached to surfaces using this structure at the base of their body.
What is a pedal disk?
This human-related issue is considered the biggest threat to seahorses due to accidental capture.
What is overfishing (or bycatch)?
Even though squid are not endangered, this human activity is a major reason their populations must still be carefully managed.
What is overfishing?
Gray whales were hunted heavily for this product made from their blubber.
What is oil?