Step outside on a clear night away from city lights and the soundscape is nothing like daytime. The birds that dominated the dawn chorus have gone quiet, replaced by an entirely different cast — owls, frogs, crickets, and a range of mammals that spend the daylight hours resting out of sight.

Owls: Silent Fliers, Loud Callers

Owls are famous for near-silent flight, thanks to specialised, soft-edged feathers that break up turbulence and muffle the sound of air moving over the wing. That silence is purely for hunting — it lets an owl approach prey undetected. Their calls, by contrast, are built to carry: the classic hoot is a low, resonant sound well suited to travelling through forest at night when there's little competing noise to drown it out.

Bats and the World Beyond Human Hearing

Most bats navigate and hunt using echolocation — emitting rapid ultrasonic calls and listening for the returning echo to build a picture of their surroundings in complete darkness. These calls are usually pitched well above the range of human hearing, which is why a sky full of actively "calling" bats can seem completely silent to us.

The Chorus on the Ground

Frogs and crickets provide much of the background hum of a summer night. Male frogs call to attract mates and to establish calling territory around ponds, often forming dense, overlapping choruses where a female must pick out one individual's call from dozens of competing voices. Crickets create their sound not vocally but mechanically, by rubbing specialised structures on their wings together — a process called stridulation — with the rate of chirping closely tied to temperature.

  • Owls — resonant hoots and screeches built to carry through forest canopy.
  • Bats — ultrasonic echolocation calls, inaudible to humans.
  • Frogs — pond-edge choruses used for mate attraction and territory.
  • Crickets and katydids — mechanical chirps produced by wing-rubbing, not vocal cords.
  • Nightjars — distinctive, repetitive calls given from the ground or low perches at dusk.

Why Night Makes Sense for So Many Species

Being active at night offers several practical advantages: cooler temperatures for animals prone to overheating, reduced competition with the huge number of species active by day, and — for many smaller animals — a meaningful reduction in the risk of being seen by daytime predators. Acoustic communication becomes especially valuable in this setting, since visual signals that work well in daylight are far less useful once the light disappears.

Different Species, Different Time Slots

Interestingly, "night" isn't one single time slot acoustically. Some species call mainly at dusk, others reach peak activity around midnight, and still others are loudest just before dawn. This kind of temporal partitioning likely helps reduce direct competition between species trying to be heard in the same frequency range at the same time.

If the daytime hum of a healthy forest interests you more, the piece on forest animals and their unique calls covers the daylight side of the same soundscape.