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Frog and Toad Science Activities for Kids

Toads are fascinating animals that are too often ignored. The new picture book, The Hidden Life of a Toad* by biologist and photographer Doug Wechsler, brings attention to these neglected creatures.

(*Amazon Affiliate link)

The main text concentrates on toad development and life cycle, complete with photographs of toads mating. Back matter is filled with supplemental information, including a glossary, toad facts, suggestions for helping toads, and details about how the author captured the photographs.

For my full review, see Nonfiction Monday blog.

Related:

Is it a Frog or Toad?

The terms “frog” and “toad” are not scientifically-based, but are common names. According to frog scientists, all frogs and toads belong to the Order Anura and are called “frogs.” Although many people call the bumpy, dry land-dwelling creatures “toads” and the smooth-skinned, pond-dwelling creatures “frogs,” in reality some species are hard to separate into one or the other group.

This brown, bumpy animal is a toad.

Toad External Anatomy

Have you ever taken a close look at a toad? You may discover some interesting things.

(Illustration based on public domain photo from Visual Hunt)

Starting with the head, prominent features are the bulging eyes. Because they are nocturnal, toads have well-developed night vision. A cool fact is that frogs and toads use their eyes to push food down their throat when swallowing. If you aren’t put off by seeing frogs eating bugs, there’s a video of frogs swallowing from David Attenborough.

Adult toads have lungs and breathe through opening called nares.

Fun fact:  Toads don’t drink water through their mouths, but absorb water through their skin by sitting in it.

Beneath the mouth, male toads have a flexible membrane called a vocal sac. The sac helps amplify the mating calls.

The circular tympanum has a dual function, serving to pass sound vibrations into the ear and also as a protective cover.

Large bumps on the back behind the head, the parotoid glands of toads produce toxic secretions. This is why you should keep pets away from toads and wash your hands after touching them.

A toad has four toes on their forelimbs (front legs) and five toes on the back. Unlike frogs, toads lack webbing between their toes. Both frog and toads are known for their ability to jump with their hind legs.

A .pdf worksheet (with blanks) to download:  toad external anatomy worksheet

Toad Life Cycle

Toads also lay their eggs in water and the eggs hatch into tadpoles.

The dark-colored dots are the frog embryos. They are protected by a gooey jelly-like substance.

The embryos grow into free-swimming tadpoles. They feed and grow, eventually developing legs. Once the tadpoles grow lungs they can move onto land and they are called “toadlets.” During that time, their tail disappears.

Activity: Life Cycle Poster

Gather:

  • Pictures of frog and toad life stages from books or the internet
  • Art supplies such as markers, crayons, colored pencils, and/or paint
  • Large sheets of paper

Encourage the children to plan and decorate a poster featuring the stages of a frog or toad life cycle. Don’t forget the toadlet stage.

Younger children might benefit from exploring life stage models.

Insect Lore Frog Life Cycle Stages

Where Adult Toads Live

Toads feed on insects and other small creepy crawlies. During the day they rest in moist, shady places. Growing some dense shrubby plants will provide them with cover.

Activity:  Make a Toad House

Instructions for making toad houses are all over the internet. Here are directions for a simple version.

Gather:

  • Clay flower pot at least six inches in diameter
  • Two potato-sized stones
  • Optional:  Acrylic paints and paint brushes

If you desire, have the children decorate the flower pot with acrylic paint. Acrylic markers work, too. Precautions:  Prior to painting, protect the work surface with a washable or disposable covering.

Once the paint is dry, find a moist, shady location outdoors. Overturn the pot and use the two stones to prop up one side. Leave enough room between so a toad can climb under. Make sure the toad house is stable, so it won’t slip off the stones and trap the toad inside. Burying it slightly on the back side or covering the back side with a small amount of soil may help stabilize it.

Providing a small tray of water nearby will help keep the area moist. Keep curious pets away and check regularly.

Interested in learning more? See our growing list of children’s books about frogs and toads at Science Books for Kids.

Bug of the Week: Looking Closer at Caterpillars

You never know what you might discover by looking at a plant. For example, while I was waiting for someone I looked at a shrub in front of a store. I saw signs of caterpillars, so I looked closer.

This leaf was rolled up. It looked suspicious. I decided to take a look inside.

There was a small green caterpillar.

It turns out it wasn’t the small green caterpillar I was expecting. The one I was expecting has a black head capsule. This one has a light-colored head capsule.

That warrants keeping an eye on it to see what it turns into. I put some leaves into a container with some moist paper towel.

Within a few days the caterpillar more than doubled in size. Its exoskeleton is so clear, you can see what it has been eating.

Let’s look closer.

Can you see the white lines that look like tree branches? Those are the tubes that carry air (oxygen) into the caterpillar’s body.

The tubes are called trachea and they originate at the round openings in the caterpillar’s sides called spiracles. We usually can’t see the trachea because the exoskeletons of most insects contain pigments that block our view.

This see-through caterpillar probably turns into a pyralid moth. With some luck, we’ll find out what kind in the next few weeks.

Bug of the Week: Insect Partners

We have some new insects on the elephant food plant in the back yard.

They are oval and covered with white wax. Do you know what they are?

These rover ants know what the white insects are:  a source of honeydew. The ants will defend the white insects and move them around to better sources of food.

The white insects are mealybugs. The two under the ant have just molted, shedding their waxy coats. Can you see the shed exoskeletons towards the lower end of the pile (they are open at the back)? Seems likely the mealybugs are most vulnerable right after molting.

Have you ever watched ants tending mealybugs?

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