What natural cue do Atlantic eels rely on to guide their thousands-of-miles migration to spawn?

Nature

Which animal can detect the Earth's magnetic field and uses it as a navigational compass during long-distance migration?

Loggerhead sea turtles can navigate thousands of kilometres of open ocean using Earth's magnetic field as a GPS — and females return to the exact beach where they hatched, sometimes 30 years later.

Nature

Atlantic eels undertake a transoceanic migration to spawn in which body of water?

Atlantic eels navigate by Earth's magnetic field, swimming thousands of miles to the Sargasso Sea to spawn—then die without ever returning home.

Nature

Which fish migrates roughly 5,000 kilometers across the Atlantic Ocean to spawn in the Sargasso Sea, where it dies shortly after?

Arctic terns migrate 44,000 miles annually—the longest animal migration on Earth—experiencing more daylight than any other creature living today.

Nature

During prolonged heat stress, what do coral polyps expel that directly causes the phenomenon known as coral bleaching?

Coral polyps expel their algae partners during heat stress, then starve without them—bleaching is essentially a symbiotic breakup caused by warming oceans.

Nature

What nickname have marine biologists given to the Atolla jellyfish's defensive bioluminescent display, which summons a bigger predator to attack its attacker?

Atolla jellyfish detonate bioluminescent alarm 'burglar alarms' when attacked, summoning larger predators to scare off their attacker.

Nature

Roughly how fast can a bladderwort's underwater trap suck in tiny prey, according to biologists?

Bladderworts are the fastest carnivorous plants on Earth, sucking in prey in 1/500th of a second—faster than a blink.