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LLAMA


(Lama glama)

Location: Andes Mountain range of South America in Peru, Chile, Bolivia and Ecuador

Habitat: grasslands, mountainous areas and deserts

Llamas and other members of the Camelid family were originally found on the central plains of North America, about 40 million years ago. Three million years ago llama-like animals moved into South America. By the end of the last ice age (10,000 – 12,000 years ago) camelids were extict in North America. Domesticated llamas were derived from guanacos in the Andean highlands of Peru 4,000-5,000 years ago. Llamas and other members of the camel family, such as alpacas, guanacos and vicunas, are now native to the south American Andes in Peru, Chile, Bolivia and Ecuador.

The average height of a llama is 45” at the shoulder and 5-6’ at the head. They weigh between 250 and 500 pounds. They have a face very similar to a common cammel. Their fur is very lightweight and oil free and is used to make sweaters, blankets, hats etc. The wool comes in many colors ranging from white to black with shades of gray, beige, brown and red. It can be solid, spotted or mared in an array of patterns.

Llamas are modified ruminants with a three-compartment stomach. They chew their cud like cattle and sheep. They have a highly effective digestive system therefore have a very low protein requirement. They eat stricly plant material. Camelids have s split upper lip which helps them sift though grass or hay when they are eating. Llamas have front teeth only on the lower jaw and a toothless uper jaw, like a gum. This helps them break off the grass at the ground level, leaving the roots for future growth. They can feed on pasture as well as hay and often times are supplemented with grain.

Llamas are strong, sturdy, hardy pack anamals. Since they originated in the Andes mountain range they can withstand extreme temperatures. They can carry about 25% to 30% of its body weight, making them as strong as a horse. Like all camelids, their feet have a cushiony leathery pad instead of a hard hoof, resulting in very low environmental impact on trails compared to horses and mules.

They are social animals that like the company of other llamas. They are gentle, curious and independent yet shy. Their intelligence and calm nature make them good work animals as well as good family pets. They serve other purposes such as being used in animal facilitative therapy, because of their calming effects. They are popular in 4-H, Scouts and other youth groups.

They communicate with each other by using a series of ear, body and tail postures. They also have a shrill alarm call and humming sounds. Llamas will usually spit at other llamas in order to divert annoying suitors, ward off a perceived threat, or most commonly, to establish pecking order at mealtime. If raised properly, within a pack, they will have no desire or need to spit at people. If they are bottle fed or raised in a petting zoo setting and are not properly socialized they may spit at a person, just because they do not know any better.
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Monkey see, monkey do Mathematical calculations



Humans are constantly making decisions with uncertain outcomes—betting on a poker hand, predicting the weather, and selecting a lane of traffic, for example. Because the consequences of such decisions are not guaranteed, we must base our decisions on clues from the environment, determining the probabilities of potential outcomes before deciding on a rational course of action.

How does the brain perform these calculations? During the formation of a decision, what happens between sensation (our interpretation of the outside world) and behavior (the manifestation of our decision)?

To answer these questions, Tianming Yang and Michael Shadlen from the University of Washington trained Rhesus Monkeys to perform "simple" statistical calculations, and measured the activity of particular neurons during the decision-making process. The results were published on June 3 in an advance online publication in Nature.

In the task, the monkeys were presented with a random series of four abstract shapes on a video screen. They then directed their gaze toward either a red or a green target light, only one of which would be associated with a juice reward. The light that would give the reward was not fixed, but could be calculated probabilistically.

Each shape (there were a total of 10) represented the probability that the rewarding target was either red or green. For example, a square strongly favors the red target as rewarding (weighted 0.9), while a triangle indicates that green will be rewarding (0.9 in the opposite direction). A cone weakly indicates the red will be rewarding (0.5 towards red), and a pac-man weakly indicates green (0.3). Thus, the probability that the monkey will be rewarded by looking at a particular target is the sum of the probabilities for each of the shapes.

With 10 shapes, there are 715 unique combinations (and 10^4 permutations), thus precluding memorization of specific four-shape patterns, and encouraging the monkeys to learn the shapes and calculate the reward probability of each target. This is a far from trivial demand of a monkey, but eventually (after two months and over 130,000 trials), they chose the correct target 75% of the time, indicating that they had learned to base their decisions on the combined probabilities for reward. This capacity of monkeys to make such subtle probabilistic deductions is quite impressive, but is only the first half of the story.

After thus establishing a complex reasoning task, the researchers could begin exploring the neural basis for these types of decisions. They measured the activity of neurons in a particular area of the brain, called the lateral intraparietal area (LIP). This area lies intermediate between the visual input (the abstract shapes) and the behavioral output (the appropriate eye movement), and is thought to carry information involved in transforming visual signals into commands to move the eyes; i.e. in making decisions that result in eye movements.

What they found was awesome. When the monkeys saw a shape, the activity of their LIP neurons was proportional to the probability associated with that shape. With each sequential shape, the neurons altered their firing rates to match the updated probability. Although it is unknown how their brains converted information from each shape to their respective probabilities, the activity of these neurons indicates that they either play a role in the transformation, or represent the outcome during the decision-making process.

Apart from showing that monkeys are closer to furry calculators than previously thought, the study has grander implications. As the authors conclude, “the present study exposes the brain’s capacity to extract probabilistic information from a set of symbols and to combine this information over time.” A similar neural process may underlie our abilities to reason about alternatives, and make decisions based on subtle probabilistic differences.
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Homemade dog food is becoming a popular option for pet owners everywhere, after the recent commercial dog food contamination scare. What exactly have we been feeding our dogs? What should we be feeding them? We pet owners take for granted that commercial store bought dog food is safe for our beloved pets. Here are the top 7 benefits that homemade dog food has to offer your canine friend.

1. Homemade dog food allows you to know exactly what your dog is eating. You don’t have to worry about contaminated food, unfit ingredients, or harmful preservatives.

2. Homemade dog food helps your dog to maintain a healthier weight. By preparing your dogs food, you are able to calorie control meals.

3. Homemade dog food helps your dog to have more energy. Homemade dog food gives your dog better quality nutrition, which helps him or her to feel better and be more playful.

4. Homemade dog food can help your dog to have a healthier digestive tract. Dogs that eat homemade dog food have less gas, smaller stools, and better smelling breath.

5. Homemade dog food can help your dog to have healthier skin. Dogs that eat homemade dog food have less shedding, a shinier coat, and better smelling fur.

6. Homemade dog food can save your money. It is true, homemade dog food actually ends up costing you less than the same amount of store bought dog food.

7. Dogs love the taste of homemade dog food. They prefer fresh, preservative free home cooking just as much as we do.
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