Which has shorter wavelength infrasonic or ultrasonic?

Which has shorter wavelength infrasonic or ultrasonic?
(ii) Can dolphin detect ultrasonic waves?
(iii) Name any one living organism which can detect infrasonic waves.

(i) Ultrasonic wave has shorter wavelength.
(ii) Yes, dolphin can detect ultrasonic waves.
(iii) Rhinoceros can detect infrasonic waves.