An online resource based on the award-winning nature guide

Posts tagged “Ranidae

Young Pickerel Frogs Underfoot

9-6-13 young pickerel frog 049If you remember visiting a pond last April or May and hearing a low, snoring sound (the mating call of the male Pickerel Frog) you might see the end results of those snores if you re-visit the pond now. Young Pickerel Frogs the size of quarters are currently abundant on the banks of the ponds in which they grew up, as well as in nearby vegetation. After emerging from the water sometime between July and September, many of these first year frogs move into nearby fields, meadows and damp woods. They are only a few weeks away from burying themselves in mud at the bottom of the pond, where they will hibernate all winter.

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Frog Vocal Sacs

4-16-13  vocal sacs“Peeps” and “quacks” fill the air these days.  How is it that these frog calls travel so far?  It’s all thanks to a thin membrane , or sac, that most frogs have. Note the single inflated sac of the spring peeper, and the paired sacs on either side of the wood frog’s head. These vocal sacs act as resonating chambers, causing the male frog’s mating call to be amplified and carried far (some species of frogs can be heard over half a mile away). Most frogs have one of three basic types of vocal sacs: a single throat sac (the most common), paired throat sacs (partially separated by connective tissue) and paired lateral sacs (completely separate chambers on either side of the head). Vocal sacs are outpocketings of the floor of the frog’s mouth. When calling, a frog closes its mouth and nostrils, and expels air from its lungs through the larynx and into the vocal sacs. The vibrations of the larynx emit a sound which resonates within the vocal sacs. The frog continues calling as muscles within its body wall force the air back and forth between the lungs and vocal sac. The thickness of the vocal sac wall in frogs varies. Typically, small frogs that call in the air (spring peeper) have thin vocal sac walls, whereas those that call in the water, particularly large species (green and bull frogs) often have thick-walled vocal sacs that appear swollen, not inflated like a balloon, when filled with air.