Mine is not making the croaking sounds BUT thank you for asking WHY is "YOUR" sink=The reason mine does not make that sound is my venting is working properly and the drain lines have been water jetted a few years ago to establish full flow=
Many species of frogs and toads make rough, croaking sounds. There are also some birds, amphibians, and fish that are also capable of making similar sounds.
they have a sound sac in their throats
frogs and toads possibly burping
Egrets make croaking, gutteral sounds. As do most other herons.
Some fish make croaking sounds at the surface. Lol nice. {I'm the chick who asked this.} ^_^ I was bored.
Secretary birds are usually silent, but when displaying they will make a horse croaking sound, similar to wood being dragged over a wash board. They can occasionally be hear making mewing sounds at night.
Common nocturnal animal sounds heard in Maine include hooting of owls, howling of coyotes, chirping of crickets, and croaking of frogs.
A frog gig will usually stop them from croaking.
The great blue heron makes a gutteral, croaking series of sounds. Starts as a whining like screech, then descends to a "frahnk' sound.
The silence that surrounded the pond was only disturbed by one croaking frog.
Yes, bullfrogs do take breaks from croaking even though they don't sleep. They may pause their croaking to rest or conserve energy.
Cormorants make a variety of vocal noises, including guttural croaks, low grunting sounds, and hoarse cackles. They are often heard making these calls while in their breeding colonies or during interactions with other cormorants.