Created: 7/19/2016 Updated: 7/24/2016
Wallace W. Atwood inside the Atwood Celestial Sphere
On July 24, 1949 the great Wallace W. Atwood died at the age of 76. As a geographer and geologist, Atwood wrote and contributed to textbooks, taught classes, and even contributed to the New Jersey Geological Survey and the Wisconsin Natural History Survey. Although you may not immediately recognize his name, he contributed an important exhibit to the history of the Chicago Academy of Sciences and one of our fellow Chicago museums.
The Atwood Sphere in 1913 (Photo from Popular Science)
The Atwood Celestial Sphere opened at the Academy in June of 1913. What set it apart from other planetariums of the period was its ability to rotate around visitors as they stood inside it. Atwood, who served on the Academy’s Board and briefly as Acting Director of the museum, designed the incredible apparatus and it helped usher in a new age of planetariums.
Illustration of the Atwood Sphere (From Popular Science)
The sphere was constructed of a thin galvanized sheet metal and only measured 15 feet in diameter. Tiny perforations in the exterior of the sphere allowed light to penetrate, appearing as stars to those viewing from the inside. Atwood designed the celestial sphere to portray the stellar sky as seen from Chicago and visitors would watch as the sun, moon, and stars rotated around them in simulation of Earth’s orbit through the solar system. The sphere was utilized heavily for educational programs at the Academy. School groups, clubs, and other visitors would tour the sphere, with programs often led by Atwood himself during his time with the Academy.
The Sphere as it looked in the Laflin Memorial Building in 1987
When the Academy began extensive redesign of its exhibits and developing life zone dioramas in the 1960s, the exterior of the Sphere was painted to look like the Earth and the ceiling of the Laflin Building painted to look like the night sky to blend more readily with the new exhibits. When the Academy moved from the Laflin Building in 1995, the Sphere was transferred to the Adler Planetarium, officially making the move on December 16, 1997. Once it was transferred the staff at the Adler began to restore it to its original 1913 appearance. The geographical features that had been built up on the Sphere’s exterior were flattened, paint was removed and the original star holes were cleaned. Instead of walking into the Sphere, visitors now enter the Sphere in a motorized cart, and the Sphere rotates around the cart, but the experience is very similar to what Academy visitors experience when they walked into the Sphere in 1913.
The Atwood Sphere as it looks today on exhibit at the Adler PlanetariumView Comments
Created: 7/12/2016 Updated: 7/29/2016
If you love pollinators as much as we do, you’re probably aware of the recent population decline of many pollinator species. The fact that 75% of our food is made possible because of pollination from butterflies, bees and other species has made this problem an international priority. Groups like the International Pollinator Initiative are working to highlight the need for public participation and awareness.
It’s become a local priority as well. On Earth Day of this year, we were happy to host ComEd as the company announced its plan to improve Monarch butterfly breeding areas around its transmission lines. Fidel Marquez, Senior Vice President of Governmental and External Affairs for ComEd, joined us to announce ComEd's plan to increase the mixture of milkweed plants used in its prairie restoration program by more than 30%. Meanwhile, at the Nature Museum, we are continually working to protect and reestablish populations of locally imperiled butterflies. Our efforts are to coordinate the restoration of their native habitat, to propagate imperiled butterflies in our Conservation Lab for the purpose of reintroduction, and to monitor butterfly populations throughout the state with the Illinois Butterfly Monitoring Network citizen science program.
Two native species we continually work within our Butterfly Restoration Project are the Regal Fritillary (Speyeria idalia), and the Swamp Metalmark (Calephelis muticum). The swamp metalmark, endangered in Illinois, is a rare butterfly that can only be found in wetlands. Its populations are small and intensely local in nature. In contrast, the Regal Fritillary was once common in tallgrass prairies across the country but now is rarely seen east of the Mississippi River. In fact, it is now threatened in Illinois. The Regal Fritillary was recently designated a priority species by the Chicago Wilderness Council with the Peggy Notebaert Nature Museum as the lead partner to coordinate regional efforts to conserve this species. We are also lead partners on two other species, the Monarch Butterfly and the Rusty Patched Bumblebee, and are currently working with Chicago Wilderness developing strategies to protect these species throughout the region.
We are also doing what we can to help out one of our most effective pollinators, the Honey Bee (Apis mellifera) by hosting a number of beehives on our green roof. You will see our bees' hard at work when you visit our outdoor exhibits Nature Trails and the Woody Wickham Butterfly Garden.
Wondering how you can work to help pollinators? Here are a few easy ways to start:
- Plant more native species and pollinator-friendly plants in your yard and garden. Check out this brochure to help you get started.
- Avoid using pesticides whenever possible. Remove pests by hand and use non-systemic pesticides such as insecticidal soap if necessary.
- Support the upkeep of our own Woody Wickham Butterfly Garden as it continues to serve as a way-station and food source for Monarchs and other species.
- Don’t use insecticides on bee swarms. If you notice a swarm on your property, contact a local honey co-op (like the Chicago Honey Co-Op) and a beekeeper will come and remove it from your property.
Thanks to Rose Pest Solutions for sponsoring this post.View Comments
Created: 7/12/2016 Updated: 7/29/2016
The plants in our prairie and Woody Wickham Butterfly Garden are in full bloom. If you have a garden of your own, you’ve probably noticed it, too. You’ve probably also noticed lots insect buzzing around, including bees. Although the fear of bees is one of the most common fears, you shouldn’t be startled or scared to see bees buzzing around your garden.
Bees are vital pollinators. They are responsible for as much as $5.2 billion of agriculture production in the US alone, and 75% of all the food we eat benefits from pollination. Seeing them in your garden means that they recognize your plants as a food source, and it means that you’re doing your part to help pollinators. That said, there are some other flying insects that are easily mistaken for bees. While most are pollinators, some are more effective than others. Here’s a quick guide to help you identify who has been buzzing around your flowers.
Honey bees (Apis mellifera)
- Honey bees are wonderful pollinators of a wide variety of flowers in the garden.
- They are usually not aggressive. Bees that are out foraging among flowers for nectar and pollen usually sting only if stepped on or swatted. They are more aggressive if you approach their nest as stinging is primarily a defense to protect their brood. If they’re in your garden, you should be okay as they are happy minding their own business. If a swarm gathers, contact the Chicago Honey Co-Op for removal.
- Workers can only sting once, and they are reluctant to do so.
Bumble bees (Bombus spp.)
- Some flowers, such as snapdragons, are much better pollinated by bumble bees because they can do buzz pollination where they forcefully vibrate and shake the pollen off of the anthers.
- They are usually not aggressive. They nest underground, and may sting in defense if directly handled or if nest is threatened.
- They can sting more than once so be mindful of nests. Try to accommodate them as much as possible, if they've chosen your garden or yard as their nesting point.
Paper wasps (HYMENOPTERA: Vespidae)
- While they will visit flowers to drink nectar and can be responsible for some pollination, paper wasps are primarily carnivores. They can help take care of garden pests and do eat other insects, such as caterpillars.
- Paper wasps such as yellow jackets can be aggressive if threatened or if you approach their nest. They can be aggravated by swatting.
- Can sting multiple times and more painful than that of a honey bee.
Sweat bees (HYMENOPTERA: Halictidae)
- There are many native species that fall under the name "sweat bee". All species are important pollen feeders and pollinators of native, wild plants.
- They can be attracted to perspiration, hence their name.
- They are a smaller species and are mostly solitary.
- Likely only sting if disturbed, not very painful feels like a slight prick.
Hover flies (DIPTERA: Syrphidae)
- While not a bee or wasp at all these mimics can be important pollinators of plants that benefit most from fly pollination. The maggots are also voracious predators known as aphid lions and are excellent at controlling garden pests like aphids.
- Can be seen hovering around flowers and sometimes will land on your skin.
- Cannot sting as they do not possess stingers.
Leaf-cutter bees (HYMENOPTERA: Megachilidae)
- Leaf-cutter bees are another important native pollinator. Larger than sweat bees, but smaller than honey bees, these bees collect pollen on their bellies and will cut circular sections from leaves to build their nests from.
- A solitary species.
- Can sting more than once but are not aggressive and unlikely to sting.
Cicada killers (Sphecius speciosus)
- While these incredibly large wasps will visit flowers and feed on nectar they are not very active pollinators. Adult cicada killers will hunt down and paralyze cicadas, then bring them back to their underground nest and feed their young.
- Although they can be intimidating, cicada killers are not aggressive and will very rarely sting only when handled or stepped on.
- Even if stung, it’s been described to feel no worse than a pinprick.
Mud daubers (HYMENOPTERA: Sphecidae or Crabronidae)
- Like paper wasps, are primarily carnivorous but adults also drink nectar and engage in some pollination.
- Create nests out of mud, can often be found on the sides of buildings. Mud daubers will fill their nests with spiders to feed their young.
- Non aggressive and will rarely sting if aggravated.
Although they all contribute to the ecology of a garden, some species of pollinators can occasionally cause a problem when they choose to nest in a poor location. If you spot a nest or hive that you feel may directly impact your safety, please contact a professional pest removal service.
Thanks to Rose Pest Solutions for sponsoring this post.
Interested in learning more about honeybees? Join us on Saturday, July 23 as Dr. Lucy King, Elephants and Bees Project Leader, joins us to talk about the multiple uses of beehive fences as a natural deterrent to reduce damaging crop-raiding by elephants. Click here for more information.View Comments
Created: 7/7/2016 Updated: 7/29/2016
If you’ve wandered through our Nature Trails or the Woody Wickham Butterfly Garden lately, you’ve probably seen a variety of pollinators and other insects. In addition to the bees that call our rooftop beehives home, you’ve probably seen a number of butterflies fluttering around. If you have your own pollinator garden, you’ve probably seen some of them there, too. But what are they? Here are six common species of butterflies you’re likely to find around the Nature Museum and in your neck of the woods.
Red Admiral (Vanessa atalanta)
Red admiral butterflies are very common and very easy to spot, thanks to their striking black forewings which featured red bars and white spots. Red Admirals are often seen in residential neighborhoods of large cities like Chicago and Milwaukee. They are frequent visitors to parks and gardens, but just as much at home in a prairie preserve. The range of the Red Admiral extends from Guatemala up into Northern Canada. While they fly year-round in Guatemala and Mexico, in the northern areas of their range they hibernate or overwinter as chrysalides. Red Admiral caterpillars eat plants of the Nettle family (Urticacea) such as Pellitory. Red Admirals can be found in most sunny places including moist fields, prairies or marshes. In urban areas, look for them in parks or along tree lined residential streets.
Viceroy (Limenitis archippus)
Viceroy butterflies closely resemble Monarchs, but their behavior is very different. Viceroys prefer wet habitats and are territorial – they will chase away other butterflies that come too close. Viceroys also fly by flapping their wings quickly, while Monarchs usually glide between wing strokes. You can also tell the difference between the two by examining their wings. A black line crosses through the veins in the Viceroy’s postmedian hindwing, but Monarch wings do not have this line. Viceroys range from the mountain states east to the Atlantic and from Texas north into the Canadian plains. They over-winter in the larva stage. Viceroy caterpillars feed on Willows, Aspens and Cottonwoods. Viceroys are usually found in wetlands and prairies with willows. They are also found in human-disturbed wet areas, like suburban lake edges.
Monarch (Danaus plexippus)
One of the most familiar North American butterflies, the Monarch is distinctive for its striking colors and as a study in butterfly biology. The caterpillars accumulate toxins from the steady milkweed diet which makes this animal poisonous to predators especially birds. Birds apparently learn to avoid eating monarchs and other butterflies, like Viceroys, that look like Monarchs. Monarchs range across North America – coast to coast – and up into southern Canada during the summer. Every autumn, millions of Monarchs migrate south and west to central California and central Mexico. Monarchs are also found year-round in Central America. Monarch Caterpillars eat Milkweed it is therefore referred to as the Monarch's Host Plant. Monarchs will inhabit almost any sunny place with flowers, including parks, gardens or prairies.
Painted Lady (Vanessa cardui)
Painted Ladies are found year-round in the deserts of the southwest. They migrate into the Midwest and northeastern states each spring and return to the southwest before winter. In some years – 1992 was one example – they may multiply rapidly across the entire continent in a population explosion. They are found on every continent except Antarctica and Australia. In North America, they live year-round in Mexico, but migrate north each year across the continent, all the way to the Arctic Circle. Painted Lady Caterpillars eat Thistle, Mallow, Hollyhock and related plants. These plants are referred to as the Painted Lady’s Host Plants. Painted Ladies are found just about anywhere that thistles grow
Cabbage White (Pieris rapae)
Cabbage Whites are imports from Europe. They first appeared in Canada in 1860 and have since spread as far as south Texas. They can be seen just about anywhere from March to November. Several generations are produced each year. The Cabbage White ranges from central Canada as far as Texas and northwest Mexico. Individuals over-winter in the chrysalis stage. Cabbage White caterpillars eat Cabbage, Radish, Mustard, Peppergrass, and related plants. The caterpillar is often considered an agricultural pest. Cabbage Whites are found in weedy habitats like vacant lots, power line right of ways and roadsides as well as in marches and gardens where its food plants grow.
Black Swallowtail (Papilio polyxenes)
In the Chicago area, these large swallowtails are first seen in April and early May. A second generation begins emerging from chrysalides in mid-June and a third generation may emerge in August or September. Black Swallowtails are attracted to butterfly gardens with fennel or dill plants. Their range extends from southern Canada to northern Mexico. They are found in Arizona, New Mexico, and the eastern half of the United States. Black Swallowtails over-winter in the chrysalis stage. Black Swallowtail Caterpillars eat Parsnips, Wild Carrots, Celery, Parsley and Dill. Black Swallowtails like sunny places with weeds and flowers, and can be found in gardens, vacant lots, old fields, pastures and marshes. They thrive in cities and suburbs due to the abundance of Queen Anne's Lace.
Thanks to Rose Pest Solutions for sponsoring this post.View Comments