2008年9月17日星期三

wood turtles

The wood turtles eats both animal and plant food items, including berries, herbs, algae, moss, fungi, grass, insects, mollusks, earthworms, dead fish, tadpoles, newborn mice and other turtles‘ eggs. It will forage on the ground, in the water, in herbaceous vegetation, and on logs.

Habitat

Prefer lowland hardwood forests and open wet meadows associated with moderate to fast current streams and rivers with sand or gravel substrates. May forage in upland deciduous mesic forest and open meadows in summer. Use south facing sandy river banks or flat sandy soil openings adjacent to rivers for nesting sites, including gravel banks, roadsides, fields, and meadows. Hatchling and juveniles prefer alder thickets associated with shorelines and are considered critical habitat for this segment of the population.



Activity

The wood turtles is primarily diurnal, although Farrell and Graham (1991) have observed that mating and nesting can extend into the night. wood turtles regulate their body temperatures by basking in the sun or cooling off in puddles and mud. Depending on local climate, wood turtles begin hibernating in October or November and emerge in April or May.

Breeding and Propagation

Male and female wood turtles often engage in a courtship ritual that involves swinging their heads at each other. When the female is receptive, the male mounts her, usually in shallow water. They are most likely to mate in spring and fall, although they can mate at any time they are not hibernating. After mating, usually in the early summer, the female turtles build a nest in a sunny, sandy bank near water. She can only produce one clutch, usually consisting of between 5 and 13 eggs, per year. Most eggs fall prey to raccoons, shrews, skunks, and other animals. Eggs hatch after between 47 and 69 days of incubation. It is reported that unlike most turtles, the sex of the hatchling is not dependent on the temperature of incubation. It is estimated that fewer than 30% of the wood turtles eggs laid hatch each year.

Ecology

The wood turtles is one of the most terrestrial turtles in the United States, and is usually found inhabiting forested areas associated with rivers or streams. The species prefers streams with harder substrates, moderate currents and clear water. The wood turtles is omnivorous and may be observed eating insects, worms, and even strawberries and blackberries! Interestingly, researchers in central Pennsylvania and Michigan have also observed wood turtles “stomping” for worms! The activity involves an individual stomping with one front foot several times and then switching and stomping with the other front foot. Researchers speculate that the vibrations created by the turtles “stomping” the ground may mimic the vibrations produced by raindrops…and as most people know, worms surface during rainfall events. Once a worm surfaces, the wood turtles quickly eats it.

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2008年9月5日星期五

Photographing Fish: 5 Tips For Frustrated Beginners

Photographing pets can often be a difficult proposition. Add water, glass reflections and the low lighting of an aquarium environment, and you've got the recipe for one extremely difficult photo shoot.

But it doesn't have to be that hard. Armed with the following tips, you can get great photos of your fish in just about any situation.

1: Get a tripod.

Tripods are usually used for non-moving subjects. But they can be immensely helpful when photographing fish, even ones that are constantly moving. Low light levels lead to slow shutter speeds. So anything you can do to stabilize the camera will be of tremendous help. The best way to photograph moving fish with your camera on a tripod is to loosen the levers on the tripod so you can move the camera freely left, right, up and down but the camera will remain in position if left alone.

2: Get your fish acquainted with the camera.

Now that you have a tripod (since you faithfully followed the first tip), set it up in front of your aquarium with the camera mounted on the tripod. Now leave it. For as long as possible... several days would be ideal. The purpose of this exercise is to get the fish used to seeing the "thing" you're constantly moving around, pointing it at them and making noises. When they're comfortable with the sight of the camera, they'll be more relaxed and less prone to dart around the tank or hide.

3: Use a digital camera.

Digital cameras allow us to "just take the picture" without worrying about whether we're wasting the film and processing money on a shot that won't be good. When you can focus on getting the best shot possible, no matter how many tries it takes, you're on the right track to get the shot you want.

4: Turn off the lights in the room.

Ambient light causes reflections on the tank glass that may ruin a perfectly good fish photograph. Eliminate all sources of ambient light that you can, and be very aware of any reflections as you shoot. If there are some reflections you can't get rid of, try putting your body between the light source and the glass to shield the tank from the light.

5: Clean the glass, cut the pumps.

Turning off the aquarium pumps before you shoot is an excellent way to clean up your shots of particles and bubbles in the water column. and if you happen to have a planted freshwater tank or reef aquarium, this will also prevent the plants or corals from swaying in your picture, turning into a blurry mess.

Cleaning the glass is probably the most overlooked step to aquarium photography, and quite possible is responsible for more ruined photos than any other issue. Remember, just because you don't see it now, doesn't mean you won't see it in the picture. Amazing how that happens. So clean the glass well, every time, before you pick up the camera.

6: A Bonus!

Have fun. Aquarium photography can become an interesting and challenging hobby all its own. Have fun with it, experiment freely, and be sure to share your pictures online!

2008年9月1日星期一

Feather Plucking : A Major Problem for the African Grey Parrot

Feather plucking is known to be a very nasty habit of the african grey parrot. They are notorious feather pluckers. It is said that the Timneh African Grey parrots are not as bad as the Congo African Grey Parrots when it comes to feather plucking. But this is not a proven fact.

First of all any parrot keeper should ask himself why do parrots pluck their feathers. There are many different reasons for this nasty habit. The African grey parrot is a parrot species that need quite much attention from his human owner. If this doesn't happens then the bird will probably get bored and this can result to feather plucking. But belive me that the this feather plucking problem is very complicated because it's very hard to resolve it. There were cases when the african greys plucked their feathers because of getting to much attention. So you just don't know exactly how to treat your bird. Dietary imbalances, or environmental problems may also take to feather plucking. Some environmental problems could be smocking very much in the room where the parrot is kept or keeping him in a space with dry air. Also is recommended for african grey parrots to get regular baths or to be exposed to some kind of moist air. The african grey parrots shouldn't encounter any frightening experiences because this can take to feather plucking.

If this nasty habit appears in you bird's daily activities than you should first see a veterinarian. He will probably try to find a physical explanation for the bird's problem. It's best to try to understand what the veterinarian explains and try to find some ways of resolving the problem. It is proven that the african grey parrot is the most intelligent species. His higher degree of intelligence, along with possible incorrect early socialization at the breeders and not understanding the bird’s intellectual needs when it becomes a companion parrot often leads to neurotic habits -- such as plucking.

Timnehs african grey parrots don't pluck their feathers as much as the congo african grey parrot. This could be because they were not as popular as the congo african parrot. Because of their duller coloration they weren't as licked as the congo.

In conclusion the feather plucking is a major problem for the african grey parrots because they are very difficult birds to take care of.