To our knowledge there are no studies concerning UV-B effects on penguins. As their eyes are exposed to a lot of UV due to the high reflectivity of snow and a marked enhancement during the ozone hole, investigation into the impact on penguins is desirable. The fact that penguins are visual predators, eating krill or fish in the water column, would make any eye damage an important issue for survival.

Global warming and ozone depletion are two separate but related threats. Global warming and the greenhouse effect refer to the warming of the lower part of the atmosphere (also known as the troposphere) due to increasing concentrations of heat-trapping gases. By contrast, the ozone hole refers to the loss of ozone in the upper part of the atmosphere, called the stratosphere.

Significant reductions in ozone content in the stratosphere above the Arctic have been observed during the late winter and early spring (January-March) in 6 of the last 9 years. However, these reductions, typically 20-25%, are much smaller than those observed currently each spring over the Antarctic (the ozone hole). The difference between ozone content in the two polar regions (see figure below) is caused by dissimilar weather patterns.

First, it's important to know that ozone plays two different roles in the atmosphere. At ground level, "bad ozone" is a pollutant caused by human activities; it's a major component of health-damaging smog. The same chemical occurs naturally in the stratosphere, and this "good ozone" acts as a shield, filtering out most of the ultraviolet light from the Sun that could otherwise prove deadly to people, animals, and plants.

The "ozone hole" is a loss of stratospheric ozone in springtime over Antarctica, peaking in September. The ozone hole area is defined as the size of the region with total ozone below 220 Dobson units (DU). Dobson Units are a unit of measurement that refer to the thickness of the ozone layer in a vertical column from the surface to the top of the atmosphere, a quantity called the "total column ozone amount." Prior to 1979, total column ozone values over Antarctica never fell below 220 DU.

The observed average amount of ozone during September, October, and November over the British Antarctic Survey station at Halley, Antarctica, first revealed notable decreases in the early 1980s, compared with the preceding data obtained starting in 1957. The ozone hole is formed each year when there is a sharp decline (currently up to 60%) in the total ozone over most of Antarctica for a period of about three months (September-November) during spring in the Southern Hemisphere.

No, they are two different (but related) issues.The greenhouse effect issue concerns the warming of the lower part of the atmosphere, the troposphere (the layer in which temperature drops with height; it is about 10-15 kilometers thick, varying with latitude and season), by increasing concentrations of the so-called greenhouse gases (carbon dioxide, methane, nitrous oxide, ozone, and others) in the troposphere.

We earthlings have damaged the ozone layer with chemicals (called chlorofluorocarbons or CFCs) that are used in refrigerators and air conditioners. This has been proved by a long series of measurements from space and on the ground. In fact, the Nobel Prize in Chemistry has been awarded to three atmospheric scientists for having discovered and explained this link.

It isn't really a "hole", but a large decrease in the total amount of ozone overhead. It is truly a large decrease over Antarctica at certain times of the year, but there are significant general reductions in ozone elsewhere, including the Northern Hemisphere. The "hole" and the general reductions elsewhere are not getting better yet. We expect that things will improve, starting early in the next century.

Ever since the link between CFCs and ozone depletion was proposed in 1974, skeptics have attacked the science behind the link and the policies of controlling CFCs and other ozone depleting substances. We have compiled a detailed analysis of the arguments of the skeptics. It is interesting to note how the skeptics are using the same bag of tricks to cast doubt upon the science behind the global warming debate, and the need to control greenhouse-effect gases.

Ozone depletion by human-produced CFCs was first hypothesized in 1974 (Molina and Rowland, 1974). The first evidence of ozone depletion was detected by ground-based instruments operated by the British Antarctic Survey at Halley Bay on the Antarctic coast in 1982. The results seemed so improbable that researchers collected data for three more years before finally publishing the first paper documenting the emergence of an ozone hole over Antarctica (Farman, 1985).

Abarca, J.F, and C.C. Casiccia, "Skin cancer and ultraviolet-B radiation under the Antarctic ozone hole: southern Chile, 1987-2000," Photodermatology, Photoimmunology & Photomedicine, 18, 294, 2002. Farman, J.C., B.D. Gardner and J.D. Shanklin, "Large losses of total ozone in Antarctica reveal seasonal ClOx/NOx Interaction, Nature, 315, 207-210, 1985. Manins, P., R. Allan, T. Beer, P. Fraser, P. Holper, R. Suppiah, R. and K. Walsh.

The term ozone "hole" refers to a large and rapid decrease in the abundance of ozone molecules, not the complete absence of them. The Antarctic ozone "hole" occurs during the southern spring between September and November.

On the theory that chlorofluorocarbons put chlorine in the upper atmosphere which destroys ozone, their manufacture has been banned. A 90 percent reduction would have been just as effective and less economically disruptive, but industry seems to be adjusting to the total ban.

All penguins come from the Southern Hemisphere and they live in places ranging from the Galapagos Islands to the coast of Antarctica.

Penguins sleep on land and while floating at sea. On land they can sleep lying down or standing up sometimes with their head tucked below on wing. Check out the Behaviors Page for more information.

Penguins have good vision both above and below the water. This is due to their ability to alter the shape of the lens of the eye to accommodate both environments. Check out the Anatomy Page for more information.

Of the 17 species of penguins in the world 3 species are endangered and 9 others are threatened. A major threat to penguins are human interference and particularly oil spils (see inset photo). Check out the individual world penguins species pages on this site for more information.

Yes, a penguin's leg is composed of a short femur, knee, tibia and fibula. The upper leg bones are not visible as they are covered in feathers giving penguins a very short legged appearance. Check out the Anatomy Page for more information.

No. A penguin's beak has sharp edges and is hooked to trap wriggling fish. The tongue and roof of the beak is lined with flexible, downward pointing spines which hold on to their slippery food. Check out the Anatomy Page for more information.

Yes. The ears are located on the sides of the head in the same location as ours but cannot be seen as the ears are covered by the penguins dense feathers. A penguins ear has no lobes it is just a simple hole.

Penguins have a streamlined body for life at sea with their legs placed at the rear of their bodies. On land this gives the penguin an upright stance and their characteristic waddle. Check out the Anatomy Page for more information.

It appears that some species do migrate from their breeding colonies to locations of abundant food supply following the breeding season.Both Rockhopper and Magellanic penguins migrate.

Usually mates will greet each other in several ways such as the ecstatic display, bowing and quivering. The mutual ecstatic display involves the pair facing each other and bowing and then pointing their bills to the sky and braying or trumpeting together. Check out the Behaviors Page for more information.

A.The penguins at the Aquarium eat fish. Some of the types of fish they eat are capelin, anchovy, herring, smelt and sardines.

The penguins are not pets. We do however handle the penguins during veterinary exams and for other husbandry needs.