In terms of loudness, bats release calls as low as 50 dB and as high as 120 dB, which is louder than a smoke detector 10 centimeters from your ear. The Little brown bat (Myotis lucifugus) can release such an extreme sound. The bright side is that due to the fact that this phone call has an ultrasonic frequency, we are unable to hear it. So "true" milk-producing mammary glands are one-of-a-kind to animals.
https://docs.google.com/spreadsheets/d/1Z-1W6dSFWi1kUZuM-pBMz8X_9Oq7AMJBho69ZG7bYgM/edit?usp=sharing