Echolocation
High-frequency ultrasonic click trains bouncing off obstacles and prey to construct detailed acoustic 3D maps in total darkness.
Beluga Whale
Nicknamed the "sea canary" for its squeals and chirps, with an unfused neck and a bulbous forehead that can break through ice for a breath.
Bottlenose Dolphin
Each dolphin is believed to keep its own signature whistle for life, and dolphins have passed the mirror test for self-recognition.
Common Vampire Bat
One of only three mammals that must feed on blood, it finds warm prey through heat-sensing pits on its face and crosses the ground on all fours to reach it.
Narwhal
Deep-diving Arctic whale whose spiral tusk can grow up to 9.8 feet and may double as a sensory tool.
Orca (Killer Whale)
Matrilineal pod dialects, cooperative wave-washing tactics, and apex oceanic dominance.
Sperm Whale
Hunts on dives that routinely reach 610 meters, fires biosonar clicks up to 236 decibels underwater, and occasionally swallows giant and colossal squid.
Vaquita
A shy porpoise with the smallest range of any whale, dolphin or porpoise