Caring For Stray Frogs in the Winter

Every winter, frog lovers around the world write to us about stray frogs that wander inside. Last week a man from Maryland wrote about finding a grey tree frog.

Dear Susan,
“I found a gray tree frog hopping around inside our gym here in Maryland. I guess he was drawn inside by the heat. Well, I took him home and have him in a fish tank with water, crickets and artificial leaves for shelter. I’ve got a heating pad that sticks to the back of the tank. I was wondering how cold I could keep my home and still have the frog be ok?” – Gianni

Gray tree frog (Hyla versicolor) by Robert A. Coggeshall on Wikipedia

Gray tree frog (Hyla versicolor) by Robert A. Coggeshall on Wikipedia

For those of you not familiar with grey tree frogs, here’s some information and to read more, a page on Wikipedia:

The gray tree frog (Hyla versicolor) is a species of small arboreal frog native to much of the eastern United States and southeastern Canada.[2]

As the scientific name implies, gray tree frogs are variable in color owing to their ability to camouflage themselves from gray to green, depending on the substrate where they are sitting. The degree of mottling varies.[3] They can change from nearly black to nearly white. They change color at a slower rate than a chameleon. The female does not croak and has a white throat; however, the male does croak and has a black/gray throat. The female is usually larger than the male.

The gray tree frog is capable of surviving freezing of their internal body fluids to temperatures as low as -8 °C.[9]



When we find stray frogs who haven’t found a place to hibernate, it’s usually because we continue to build within the areas of their habitat, and they may get lost or confused. Going inside where the heat is on shows that this frog is trying to survive through the winter. It’s wonderful when people care enough to help them.

Rescued Grey Tree Frog in Winter

We’ve found a great site with tips on how to care for frogs and get them through the colder months, so they’ll be healthy and ready to go back outside come spring.

How to Take Care of a Pet Frog


Here are two of our previous posts that help explain what happens to frogs in the winter:

Winter is Coming: How Do Frogs Avoid Freezing


How Frogs and Toads Adapt To Winter’s Chill



Earth Day 2012: Plant a Tree!

This Earth Day, our theme is simple: Plant a tree. We were inspired by a recent op-ed by Jim Robbins in the New York Times: “Why Trees Matter. “And we were also inspired by the beauty of the springtime trees around us.

At Stevens Institute, Hoboken. Photo by Mary Jo Rhodes

In the NY Times piece, Robbins explains how trees are at the forefront of climate change. Hot, drier weather is stressing, and often killing, trees worldwide. The examples he cites include some of North America’s most ancient trees, the alpine bristlecone forests, which are falling victim to a voracious beetle and an Asian fungus. Prolonged droughts have killed more than five million urban shade trees last year. In the Amazon, two severe droughts have killed billions more.

And yet, trees perform essential functions that we don’t always appreciate. Here are a few Robbins highlights:

  • Through photosynthesis, trees turn sunlight into food for insects, wildlife, and people (apple or pear anyone?), as well as create wood for fuel, furniture, and homes. Trees contribute to our emotional well being by providing beauty in our surroundings and much needed shade.
  • When tree leaves decompose, they leach acids into the ocean that help fertilize plankton. When plankton thrive, so does the rest of the food chain. Fishermen have replanted forests along coasts and rivers to successfully bring back depleted fish and oyster stocks.
  • Trees release beneficial chemicals that seems to help regulate the climate; others are anti-bacterial, anti-fungal and anti-viral. Aspirin’s active ingredient, for example, comes from willows.
  • Trees are the planet’s heat shield. They keep the concrete and asphalt of cities and suburbs 10 or more degrees cooler and protect our skin from the sun’s harsh UV rays.

Plant a Tree

I live in one of the most densely populated cities in the U.S. Some years ago, I planted a small tree (about a foot high, purchased from a nursery) in our backyard with my sons. The tree is now about 20 feet high and we enjoy watching the leaves change each fall and the birds hanging out on the branches.

No matter where you live, you can plant a tree.

Even if you live in an apartment and don’t have a back yard, you might be able to find a tree-planting initiative in your city. New York City, for example, has an initiative called MillionTreesNYC, in which volunteers plant trees or adopt trees and care for them after they’re planted.

View of Empire State Building, at Stevens Institute of Technology, Hoboken. Photo by Mary Jo Rhodes.

And, of course, our amphibian friends need trees, especially those arboreal frogs in the Hylidae family, many of which live in tropical and temperate forests.

For more information (including information about where to buy tree seedlings), see the Arbor Day Foundation.

Happy Earth Day!