a bat
bat
Bats. They are blind and use echolocation to navigate when they are flying. They emit high pitched sounds humans ears are unable to hear. The sound frequency in a human voice is too low pitched for them to hear.
Humans cannot hear the high-frequency sounds produced by dolphins because their hearing range is different from ours. Dolphins communicate with each other using ultrasonic frequencies above the human hearing range, typically between 20-160 kHz, which is why we cannot hear their sounds.
homophones or homonyms exmaple sea and see or buy and bye
whale, dolphin
Rabbit
Whales navigate with subsonic vibrations. like sonar
Ultrasound
words that sounds the same but is spelt differently
Audible sound is what is actually heard. Some people will interpret audible sounds differently depending on their ability to hear as well as their perceptions. Animals can "hear" sounds that humans cannot hear. There are ranges of sound that are normal for humans.
Humans may use sounds they cannot hear for various reasons such as communication with animals or in technological applications like ultrasound testing. These sounds are either outside the range of human hearing or used for specific purposes where their direct perception is not necessary.
Since dogs can hear high pitched sounds humans cannot hear, it is more likely a dog becomes frightened or upset from something the dog hears that you cannot hear.