Category Archives: Learn about Frogs

10/9/12

Calling All Frog Artists! A Reminder about the Frogs Are Green Kids' Art Contest 2012

Now that school is underway and the weather is getting colder (at least in this part of the world), it’s the perfect time to create some frog art. We hope you will consider submitting your frog art masterpieces to Frogs Are Green for our 2012 Kids’ Art Contest.

Here are the details:

Contest theme: IT’S EASY BEING GREEN!

Your artwork can be about frogs, how we can help them, or about ways we can be green at home, at school, or in the community. Your art can really be anything that inspires you about frogs or other amphibians. A winning piece from last year’s contest, for example, submitted by Ula Lekecinskaite, a 12-year-old girl from the Kaunus Art Gymnasium in Lithuania, celebrates frogs and rainy days:

We will award winners based on age in these age groups: 3-6, 7-9, and 10-12. The winners will receive a Frogs Are Green poster of their choice from our store and a winner’s certificate. All kids who enter the contest will receive a certificate of participation that can be downloaded from our site.

We’re looking for drawings, paintings, sculpture, collage, mixed media, or whatever format helps you express yourself.

Deadline for submissions is December 15, 2012; winners will be announced January 15, 2013. The winners will be featured in a post.

This year we have a new contest area using Flickr, where you can enter yourself. You must add a caption/ description with your Name, Age, and Country or your submission will not be included. Please see the contest page for more details.

We can’t wait to see your artwork!

And photographers—don’t forget that we are still accepting photographs of frogs and other amphibians for our 2012 photography contest. See the contest page.

08/25/12

Frogs Are Blue!

Most people think frogs are green, right? And it’s true, most frogs are a greenish, brownish, yellowish color, the better to hide from predators among grass and other vegetation.

But frogs can be many different colors, even bright crayon colors like sky blue.

This three-centimeter-long blue tree frog in a tree in Chofu, western Tokyo. Courtesy of Toba Aquarium, Japan.

Why would a frog species evolve such a bright vivid color that would make it stand out? In most cases the frog, such as the colorful dart frogs, are giving a strong warning to predators: Don’t eat me! I’m poisonous! Either through instinct or through learning the hard way, predators will avoid them. These brightly colored frogs contain poisons that can kill or paralyze an animal that comes into contact with it.

The frog’s skin is not actually blue. The color comes from layers of chromotophores, or pigment-containing and light-reflecting cells between the dermis and epidermis (inner and outer skin layers). A blend of the three types of chromatophores creates the color, or in some cases, even transparency:

melanophores: contain pigments that appear black or brown from melanin

xanthophores: contain yellow colored pigments

iridophores: contain reflective or iridescent pigments

So although most of the time, frogs are green, sometimes Frogs Are Blue!

08/7/12

A Green Frog (at Frogs Are Green)

At Frogs Are Green, we’ve posted about tomato red frogs, blue frogs, and yellow-and-black spotted frogs, but I don’t think we’ve ever written about the Green Frog (Rana clamitans).

Green frog camouflaged in grass. Photo by Mary Jo Rhodes

Recently I visited my sister, who lives in the woods in Connecticut. On our first night, there was heavy downpour. When I woke the next morning, I heard what sounded like someone plucking a loose banjo string. Coming from the city, I was thrilled: it was my welcome call from a Green Frog outside! My sister has built a couple of frog/koi ponds on her property. Although fish and frogs aren’t supposed to co-exist (fish eat the frogs’ eggs), somehow it has worked out.

Frog pond in CT

The Green Frog is mainly aquatic, but they often rest by the side of the pond, leaping in when danger approaches. Males have a tympanum (external hearing structure) twice the diameter of the eye and a bright yellow throat.

Green Frog. Notice the large eardrum behind his eye. Photo by Mary Jo Rhodes.

Green frog in reeds. Photo by Mary Jo Rhodes

You might see Green Frogs in ponds, lakes, and swamps—they are one of the most common frogs in the eastern U.S.

Just in case you’re out in the country this summer, here is what it sounds like:

07/25/12

Guest post: A Herpetologist Chases Frogs with Tails

We were so pleased to receive a guest post from Sara E. Viernum, a herpetologist with over 10 years of experience chasing snakes and salamanders around the U.S. When she’s not chasing reptiles and amphibians in the field, Sara is blogging about them on her website The Wandering Herpetologist, which is devoted to all things reptile and amphibian related. She currently resides in San Antonio, Texas, with her wonderful husband and her pet milk snake, Nyarla The Crawling Chaos. Sara also has a Facebook page.

For two field seasons in 2010 and 2011 I had the pleasure of hunting for aquatic amphibians in the Tillamook State Forest in Western Oregon. I was helping a friend with her graduate research focusing on the effects of fish passable culverts on aquatic amphibians. We spent many, many fun-filled hours crawling around in streams in the forest looking for Pacific giant salamanders (Dicamptodon tenebrosus), Columbia torrent salamanders (Rhyacotriton kezeri), and Pacific tailed frogs (Ascaphus truei).

Male Pacific tailed frog showing his "tail". Photo courtesy Sara Viernum.

The tailed frogs were such interesting amphibians. I had never seen these strange little frogs before we started the stream surveys. The tadpoles have specialized sucker mouths that they use to hold onto the rocks in the fast-flowing currents of the streams. They will also adhere to a collection bucket and your hand. If that’s not strange enough the adult males have a little “tail.” The “tail” is actually an extended cloaca that is used for internal fertilization. The Ascaphus frogs are the only frog species that have internal fertilization.

Pacific tailed froglets showing color variations. Photo courtesy Sara Viernum.

Tailed frogs are members of the Leiopelmatidae family (Tail-wagging frogs). There are only two species in this family found in North America – the Pacific tailed frog and the Rocky Mountain tailed frog (Ascaphus montanus). The family is considered to be one of the most primitive. The frogs cannot vocalize (call) and they do not have an external ear or a middle ear bone. Their closest relatives are the Leiopelma frogs from New Zealand which are also considered to be primitive frogs too.

Pacific tailed frog tadpole suctioned to Sara's hand. Photo courtesy Sara Viernum.

The Pacific tailed frogs could be quite common in some of the streams and were always a treat to find, although it was sometimes difficult to get to tadpoles to let go of your hand.

Pacific tailed frog tadpole showing its sucker mouth. Photo courtesy Sara Viernum.

06/11/12

Remarkable Frog Dads of Papua New Guinea

This is an updated repost of a Father’s Day post from 2009.

Most animal dads aren’t too involved with their offspring (human dads, excepted of course). But two species of frogs, Liophryne schlaginhaufeni and Sphenophryne cornuta, in the microhylid frog family are devoted dads, and in fact, carry their their brood of up to 25 froglets piggyback style through the rain forest of Papua New Guinea. The frogs were discovered by evolutionary biologist David Bickford.

While most frogs start their lives as tadpoles, these frogs undergo “direct development.” They bypass the tadpole stage and go straight from larvae to miniature versions of adults while still inside the egg. This is an adaptation that allows the frog to reproduce in regions without bodies of water nearby.

After the mother frog lays the eggs, she hops off while Dad watches over the clutch, warding off predators, and keeping the eggs moist for about a month.

copyright David Bickford

copyright David Bickford

After the froglets hatch from the eggs, they hop on Dad’s back. He carries them by night through the leaf litter in the rain forest. The froglets have a free ride until they grow up a bit and can live independently (hmmm…sounds familiar).

This is an updated repost of a Father’s Day post from 2009.

05/21/12

The Map of Life: Where in the World Are Frogs?

A research team involving Yale University and the University of Colorado Boulder has developed a first public demonstration version of its “Map of Life,” an ambitious Web-based project designed to show the distribution of all living plants and animals on the planet.

According to their press release, the demo version allows anyone with an Internet connection to map the known global distribution of almost 25,000 species of terrestrial vertebrate animals, including mammals, birds, amphibians, reptiles and North American freshwater fish.

The researchers compiled information about the animals from different sources: field guides, museum collections, and wildlife checklists from scientists, conservation organizations, and “citizen scientists.” They hope that scientists and informed amateurs will supply new or missing information about the distribution and abundance of particular species.

The Map of Life allows users to see several levels of detail for a given species — at its broadest, the type of environment it lives in, and at its finest, specific locations where the species’ presence has been documented. One function allows users to click a point on the map and generate a list of vertebrate species in the surrounding area. More functions will be added over time, according to the team.

the map of life

“It is the where and the when of a species,” said Walter Jetz, associate professor of ecology and evolutionary biology at Yale and the project lead. “It puts at your fingertips the geographic diversity of life. Ultimately, the hope is for this literally to include hundreds of thousands of animal and plant species and show how much or indeed how little we know of their whereabouts.”

Eventually they hope that anyone, anywhere will be able to use their mobile devices to instantly pull up animal and plant distributions and even get a realistic assessment on the odds of encountering a particular species of wildlife.

The researchers  have created two video demos.

 

At Frogs Are Green, we think this will be a great project both as a learning tool (you can plug in a species name and get an overview of information about the species and where the species is found), but  it will also give scientists a tool to understand the biodiversity of a particular area.

Click, to try out the Map of Life.