Month: May 2009 (Page 2 of 4)

Weekend Science Fun: Insect Architects

Do you have any idea what the hummingbird and the paper wasp from the two previous posts have in common? Answer:  both construct interesting and complex nests without the benefit of opposable thumbs.  Have you ever wondered how animals make some of their incredible homes? Let’s take a look at some insect architects this week, and possibly get some ideas for our own construction.

1.    Paper Wasps and Hornets

paper wasp

At least 22 species of paper wasps are found in North America and hundreds more species worldwide. They are social insects, which means one female lays the eggs and her daughters help her take care of the resulting offspring.

The paper wasps get their name from the fact they build a nest of a papery material made of thin wood strips and saliva mixed together. Paper wasp nests may be found under eaves or hidden within dense shrubs. Example paper wasp nest

The paper wasps usually construct their nest on a slender stalk and it looks sort of like an upside-down umbrella. The base of the nest contains openings or “cells” where the eggs are laid, and the larvae and pupae are cared for.

Paper wasp inspired activities:

  • Paper wasp coloring sheet
  • Papermaking with recycled paper
  • Construct a paper house. You can fold and decorate a paper house as described here.
  • Can paper be used to build actual houses for humans? People are starting to try different paper mixtures. One, called “papercrete,” has already been used to make real houses. Here is a photo of bricks made of paper used to make a house in Phoenix.

bricks made of paper

  • Design and build your own paper house. Be sure to think outside the box, so to speak. Try paper bags, cardboard egg cartons, etc and create new building shapes. I’d love to see what you come up with.

2.    Bumble bees

Bumble bees are large, fuzzy bees that are often yellow and black. They are social, which means they live in groups with a queen that lays the eggs and her daughters that help her, just like the paper wasps.

Bumble bee nests are made of a waxy material, like the wax honeycombs of honey bees, except the cells are oval and are not at all uniform in size or shape.  Bumble bees typically nest in the ground, for example in abandoned mouse burrows.

Bumble bee inspired activities:

  • Bumble bee coloring sheet
  • Building
    Design and try to make a building out of soap bars, modeling clay or beeswax, if available. How does this material differ from the paper you used above? Does its softness limit the shapes you can make?

3.    Honey bees

Honey bees make elaborate honeycombs out of a wax they secrete themselves.

honeycomb

honey bee combs

Generally honey bees build this comb within an enclosure, such as a hollow tree. Honey bees maintained by people build their comb inside special wooden frames inside a hive box.

Honey bee inspired activities:

Bee Hives and Skeps
Do you know what a skep is? You may have seen these old-fashioned beehives used as decorations. They are coils of straw or dried grass twisted into a dome or bell shape.

bee skep bottle

Gather some crafting raffia or similar materials. Coil the raffia in a circle to make the base and then fix by sewing or with hotmelt glue. Continue to coil the next layers in increasingly smaller circles until you have created a skep shape. Either paint with bees or craft some bees for decorations.

Geometry:
Why are honey bee cells in the honeycomb in the shape of hexagons? Can you come up with a better shape? Remember that the larvae inside are rounded. Check this link for hints.
http://ag.arizona.edu/pubs/insects/ahb/act18.gif

4.    Ants

Because they often live underground, we might not give as much thought to the nests constructed by ants. Dr. Walter Tschinkel has modified an older technique for looking at the structure of ant nests by pouring dental plaster into the tunnels, allowing it to dry and then digging up the nest, giving a negative-space impression of some truly impressive ant nests.

Dr. Walter Tschinkel’s Ant Castles can be found at the Florida State University. He’s says that the ants can build the huge one at the bottom in just five days!

Ant inspired activities:

  • Watch ants build tunnels in a homemade ant farm
  • Design and draw plans for an underground home. What would be the advantages of living underground? What might some of the problems be?

Books for more ideas and information:

Roberto, The Insect Architect by Nina Laden

Roberto is an incredibly fun fiction picture book, both for those interested in architecture and those interested in insects.

Nonfiction:
Hornets: Incredible Insect Architects (Insect World) by Sandra Markle

Burrows, Nests & Lairs: Animal Architects by Lark Books (Editor)

Animal Architects by John Nicholson

This award-winning book covers many Australian animals.

Animal Architects – How Insects Build Their Amazing Homes by W. Wright Robinson

Disclosure: I am an affiliate for Amazon. If you click through the linked titles or ads and make a purchase, I will receive a small commission at no extra charge to you. Proceeds will be used to maintain this self-hosted blog.

Bug of the Week: Paper Wasp

This morning it has been partly cloudy, but during a burst of sunshine I was able to catch a photo of this paper wasp, Polistes flavus.

paper wasp

Any idea what she might be doing?

paper wasp

Look how shiny she is. Her eyes are shaped like kidney beans. She has three smaller eyes called ocellae in a triangle at the top of her head.

She was hunting for caterpillars and other insects. Wasps feed their young larvae bits of insects they catch and bring back to their extraordinary paper nests.

You might wonder whether I was in any danger taking this photo. In fact, this species of paper wasp that we encounter in Arizona is surprisingly unassuming. Unless you directly threaten their nest, they are not likely to sting. Their nests are often hidden in the dense foliage in small shrubs, such as rosemary bushes or under red yucca (hesperaloe) in our yard. We are much more likely to be stung by bees than these wasps.

I have noticed several paper wasps around my mint plants lately. I hope they are catching the cabbage loopers that have been devastating the plants. Go wasps, go.

Weekend Science Fun: Ecosystem Under Glass

Building and maintaining a terrarium or an “ecosystem under glass” can be a fun science project.

I.    Choose the habitat you would like to study.

Do you want a natural terrarium? A traditional deciduous hardwood forest terrarium might include mosses, ferns and woodland plants. Other terrarium ideas are tropical rain forest, desert or boggy/swampy with carnivorous plants. Research the soil types, plant species you will need, amount of water to provide and what type of sunlight the plants will need. For example, a terrarium that represents the rain forest floor will need a lot less sunlight than one that represents the upper canopy.

Younger children may enjoy a less complicated project, such as simply a few dandelions and some grass from the yard.

II. Gather:
1.    Clear container of plastic or glass
a.    Examples: a food container, such as a large plastic bin that prepared lettuce comes in, a plastic pet habitat, or an aquarium
b.    Tops are optional, but helpful. You will need plastic wrap if you don’t have a top.

2.    Pebbles
3.    Soil, selected to match habitat
4.    Plants – either native or houseplants that are small enough to fit your habitat
5.    Items to add visual interest, such as twigs, rocks, seashells…
6.    Gardening trowel or old spoon (digging implement)

III. Basic instructions
1.    Layer the pebbles in the bottom of the container, roughly one inch deep.

aquarium

This is a garage sale aquarium.

terrarium

2. Add soil until the container is roughly one third full. Create dips, mounds and valleys to add visual interest.

3. Decide on which side of the container will be the front. Plant the taller plants towards the back, smaller, low growing plants towards the front.

terrarium

4. Water thoroughly, taking into consideration the type of habitat you have prepared.

5. Cover the terrarium. Use plastic wrap and a string or large rubber band to hold it on if you don’t have a cover.

Watch as condensation forms on the sides of the container during certain times of the day. You can even see droplets form on the top and “rain” down. A terrarium can be used to study the water cycle.

Once your plants are established, you may consider adding soil creatures. The soil creatures can add an element of interest, but also require more care. Also keep in mind that many soil creatures are active at night.

If you try earthworms, make sure you have the right kind of earthworm. The red wigglers used in worm bins live in leaf litter at the surface of the soil in nature. They do better in bin than a terrarium unless you provide leaves for them.

garden snail

Slugs and snails eat plants. They will both require extra food, such as vegetable scraps, and snails need a calcium source like a clean eggshell. Rolypolies or sow bugs do well in a terrarium, but also need added food. Carrots are good for rolypolies. If you add creatures, be sure to keep the terrarium clean. Vegetables can harbor small mites and/or springtails as well as become moldy.

A well-maintained terrarium may be an interesting science project. Study how fast the plants grow and which types survive best under the conditions provided. If you can keep the mosses happy, you will be able to see the different reproductive structures such as the sporangium and gametophyte. Mosses are non-vascular plants so they must absorb water directly from the soil. They do not have true roots or leaves. Spend time observing different types of mosses and learning about them.

Carnivorous plants require very special care but are also fascinating.

pitcher plant

These are pitcher plants. Insects fall into the “pitcher” and can’t crawl out again.

Hope you give a terrarium a try.

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