Ocean animals from sharks and whales to octopuses.
Test your knowledge with these top questions!
Which adaptation helps whales and dolphins retain body heat in cold water?
Blubber works like a built-in wetsuit, slowing heat loss through a cetacean's skin.
Which feeding method lets a right whale swim continuously with its mouth open?
Right whales trap copepods in hairlike baleen fringes while seawater passes through their open mouths.
Biologically, every dolphin belongs to which larger group?
Dolphins are odontocetes, the toothed branch of cetaceans that also includes sperm whales and narwhals.
Which paired tissues vibrate to generate echolocation clicks in most toothed whales?
Toothed whales recycle air within their nasal passages, where vibrating phonic lips create high-frequency clicks.
What does a bottlenose dolphin's signature whistle primarily signal?
Each bottlenose dolphin develops a distinctive signature whistle that can identify it to other dolphins.
Where do gray whales often scoop up the amphipods they eat?
Gray whales often roll onto one side and leave mud plumes and feeding pits as they suck prey from sediment.
A 2014 study documented a nearly 3,000-meter dive by which whale?
A satellite-linked tag recorded the 2,992-meter dive, which set a new mammalian depth record in that study.
Which relative anchors a resident killer whale family group?
In resident populations, sons and daughters commonly remain with their mother for life, forming stable matrilines.
Which "whale" is actually the largest member of the dolphin family?
Orcas belong to Delphinidae, the oceanic dolphin family, despite their familiar "killer whale" name.
How do humpback songs usually compare among males in one population?
Shared songs change as males copy new phrases, and some song patterns spread between populations.