Wildlife
Ultrasound is high frequency sound that's above the range of human hearing. Some animals produce ultrasound for communication or for navigation. Baby rats call to their mothers with high pitched squeaks inaudible to humans. Dolphins use ultrasound to echolocate and find their way around in murky or dark water.
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Vampire supersenses
Vampire bats use super senses, razor-sharp teeth and special saliva to feed on blood.
Vampire bats use various super senses such as echolocation to find their prey. Once a victim is located, razor-sharp teeth and special saliva containing anticoagulants is used to prevent their blood-filled victim's wound from healing. This provides a steady pool of blood for them to lap up.
River dolphins at night
Pink river dolphins use sound to navigate and hunt in the flooded forest at night.
Pink river dolphins use sound to navigate and hunt in the flooded forest at night.
Flying blind
Oilbirds use clicks much like bat echolocation to navigate in dark caves.
Oilbirds use clicks much like bat echolocation to navigate in dark caves.
Echolocation lifeline
Narwhals use sound to map vital air holes in the ice.
Narwhals use sound to map vital air holes in the ice.
Biggest predator
Sperm whales are only at the ocean surface for 10 minutes at a time.
The sperm whale is a serious predator holding an impressive set of records - it can dive the deepest of any mammal, produce the loudest sound of any animal, it's the largest living toothed animal, and its head contains the largest brain of any animal.
Brown long-eared bat
Common vampire bat
Daubenton's bat
Greater bulldog bat
Horseshoe bats
Lesser horseshoe bat
Little bent-wing bat
Mexican free-tailed bat
Noctule bat
Serotine bat
Soprano pipistrelle
Vesper bats
Brants's whistling rat
Common shrew
Amazon river dolphin
Antarctic minke whale
Beluga whale
Bottlenose dolphins
Common bottlenose dolphin
Harbour porpoise
Indo-Pacific bottlenose dolphin
Killer whale
Northern bottlenose whale
Pantropical spotted dolphin
Peale's dolphin
Sperm whale
White whalesOther Communication and senses behaviours
Take a trip through the natural world with our themed collections of video clips from the natural history archive.
Nature's record breakers
Animal kingdom record breakers - how fast can a cheetah run, how heavy is an elephant and what's bigger than a dinosaur? Watch amazing video clips from the BBC archive and uncover the fascinating facts about our smallest primate, the longest stick insect and the most venomous snake.
Life in slow motion
Slow motion filming techniques transform amazing wildlife moments into full scale events, and simple action into incredibly detailed video sequences.
David Attenborough's favourite moments
Watch the most memorable moments from an incredible career watching wildlife, chosen by Sir David from the BBC archive.
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Woolly bear moths