The General Intelligence of Rats

Early studies found evidence both for and against measurable intelligence using the "g factor" in rats. Part of the difficulty of understanding animal cognition generally, is determining what to measure. One aspect of intelligence is the ability to learn, which can be measured using a maze like the T-maze. Experiments done in the 1920s showed that some rats performed better than others in maze tests, and if these rats were selectively bred, their offspring also performed better, suggesting that in rats an ability to learn was heritable in some way.

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Rat Tails

The characteristic long tail of most rodents is a feature that has been extensively studied in various rat species models, which suggest three primary functions of this structure: thermoregulation, minor proprioception, and a nocifensive-mediated degloving response. Rodent tails—particularly in rat models—have been implicated with a thermoregulation function that follows from its anatomical construction. This particular tail morphology is evident across the family Muridae, in contrast to the bushier tails of Sciuridae, the squirrel family. The tail is hairless and thin skinned but highly vascularized, thus allowing for efficient countercurrent heat exchange with the environment. The high muscular and connective tissue densities of the tail, along with ample muscle attachment sites along its plentiful caudal vertebrae, facilitate specific proprioceptive senses to help orient the rodent in a three-dimensional environment. Murids have evolved a unique defense mechanism termed degloving that allows for escape from predation through the loss of the outermost integumentary layer on the tail. However, this mechanism is associated with multiple pathologies that have been the subject of investigation.

Multiple studies have explored the thermoregulatory capacity of rodent tails by subjecting test organisms to varying levels of physical activity and quantifying heat conduction via the animals' tails. One study demonstrated a significant disparity in heat dissipation from a rat's tail relative to its abdomen. This observation was attributed to the higher proportion of vascularity in the tail, as well as its higher surface-area-to-volume ratio, which directly relates to heat's ability to dissipate via the skin. These findings were confirmed in a separate study analyzing the relationships of heat storage and mechanical efficiency in rodents that exercise in warm environments. In this study, the tail was a focal point in measuring heat accumulation and modulation.

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Bombardier Beetle Sprays Acid From Its Rear | Life | BBC Earth

These oogpister and bombardier beetles have developed a deadly defence mechanism - a sharp spray of boiling acid from the rear!

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No-See-Ums, Subfamilies

The Leptoconopinae is a subfamily of biting midges. The larvae are recognized by their unique sclerites of the head, and by their mouthparts.

The Forcipomyiinae are a subfamily of biting midges. In this subfamily, both anterior and posterior prolegs are present on the larvae. Larvae are both terrestrial and aquatic, and feed primarily on algae and fungi. Some species are important pollinators of tropical crops such as the cocoa bean.

Larvae of species in the Dasyheleinae subfamily are characterized by an anal segment with retractile posterior prolegs. Larvae are aquatic and adults do not feed on vertebrate blood, nor do they prey on other insects. They take nectar only, an unusual feeding behavior within the Ceratopogonidae.

The Ceratopogoninae subfamily has elongated larvae without prolegs or hooks. Most larvae of this subfamily are predatory. Adults generally take vertebrate blood or attack other insects. Most females in the subfamily Ceratopogoninae feed on insects similar to them in size.

The oldest known member of the family is Archiaustroconops besti from the Purbeck Group of Dorset, England dating to the Berriasian, around 142 million years ago.

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Ceratopogonidae : No-See-Ums

Ceratopogonidae is a family of flies commonly known as no-see-ums, or biting midges, generally 1–3 millimetres (1⁄16–1⁄8 in) in length. The family includes more than 5,000 species, distributed worldwide, apart from the Antarctic and the Arctic.

Ceratopogonidae are holometabolous, meaning their development includes four life stages: egg, larva, pupa, and imago or adult. Most common species in warmer climates will take about two to six weeks to complete a life cycle. Both adult males and females feed on nectar. Most females also feed on the blood of vertebrates, including humans, to get protein for egg-laying. Their bites are painful, and can cause intensely itchy lesions. Their mouthparts are well-developed for cutting the skin of their hosts. Some species prey on other insects.

Larvae need moisture to develop, but also air and food. They are not strictly aquatic or terrestrial.

Some species within the biting midges are thought to be predatory on other small insects. Particularly mosquito larvae have been investigated as common prey for biting midges in the genus Bezzia. For example, experiments have been conducted on the species Bezzia nobilis that suggest their reliance on mosquito larvae as one source of prey. They can also be hematophagous parasites of invertebrates, depending on whether the bloodsucking attack is fatal.

Like other blood sucking flies, Culicoides species can be vectors of disease-causing pathogens. Among diseases transmitted are the parasitic nematodes Mansonella, bluetongue disease, African horse sickness, epizootic hemorrhagic disease, arboviruses, and nonviral animal pathogens.

Historically, numbers were managed with the insecticide DDT as with Leptoconops torrens populations in California. They can be trapped by luring them with carbon dioxide. Most midges are small enough to pass through ordinary insect window screening. They can be repelled with DEET, oil of Eucalyptus, or Icaridin. Their larvae have also been shown to be susceptible to treatment with commercially available preparations of Bacillus thuringiensis israelensis.

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ROLLIN` SAFARI - what if animals were round?

Some common wildlife scenes in the world of "Rollin`Wild".

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Mice As As Pets

Many people buy mice as companion pets. They can be playful, loving and can grow used to being handled. Like pet rats, pet mice should not be left unsupervised outside as they have many natural predators, including (but not limited to) birds, snakes, lizards, cats, and dogs. Male mice tend to have a stronger odor than the females. However, mice are careful groomers and as pets they never need bathing.

Well looked-after mice can make ideal pets. Some common mouse care products are:

• Cage – Usually a hamster or gerbil cage, but a variety of special mouse cages are now available. Most should have a secure door.
• Food – Special pelleted and seed-based food is available. Mice can generally eat most rodent food (for rats, mice, hamsters, gerbils, etc.)
• Bedding – Usually made of hardwood pulp, such as aspen, sometimes from shredded, uninked paper or recycled virgin wood pulp. Using corn husk bedding is avoided because it promotes Aspergillus fungus, and can grow mold once it gets wet, which is rough on their feet.

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Emotions & Diet of Mice

Emotions

Researchers at the Max Planck Institute of Neurobiology have confirmed that mice have a range of facial expressions. They used machine vision to spot familiar human emotions like pleasure, disgust, nausea, pain, and fear.

Diet

In nature, mice are largely herbivores, consuming any kind of fruit or grain from plants. However, mice adapt well to urban areas and are known for eating almost all types of food scraps. In captivity, mice are commonly fed commercial pelleted mouse diet. These diets are nutritionally complete, but they still need a large variety of vegetables.

Despite popular belief, most mice do not have a special appetite for cheese. They will only eat cheese for lack of better options.

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Award-Winning Footage Of The Microsopic World Around Us

This year’s Nikon Small World Motion Photomicrography Competition has given us a fascinating glimpse into the realm of the extremely tiny. Watch a flea giving birth and a zebrafish embryo developing its complex nervous system. And that’s just the start.

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Lice In human Culture : In Social History

Lice have been intimately associated with human society throughout history. In the Middle Ages, they were essentially ubiquitous. At the death of Thomas Becket, Archbishop of Canterbury in 1170, it was recorded that "The vermin boiled over like water in a simmering cauldron, and the onlookers burst into alternate weeping and laughing". The clergy often saw lice and other parasites as a constant reminder of human frailty and weakness. Monks and nuns would purposely ignore grooming themselves and suffer from infestations to express their religious devotion. A mediaeval treatment for lice was an ointment made from pork grease, incense, lead, and aloe.

Robert Hooke's 1667 book, Micrographia: or some physiological descriptions of minute bodies made by magnifying glasses with observations and Inquiries thereupon, illustrated a human louse, drawn as seen down an early microscope.

Margaret Cavendish's satirical The Description of a New World, Called The Blazing-World (1668) has "Lice-men" as "mathematicians", investigating nature by trying to weigh the air like the real scientist Robert Boyle.

In 1935 the Harvard medical researcher Hans Zinsser wrote the book Rats, Lice and History, alleging that both body and head lice transmit typhus between humans. Despite this, the modern view is that only the body louse can transmit the disease.

Soldiers in the trenches of the First World War suffered severely from lice, and the typhus they carried. The Germans boasted that they had lice under effective control, but themselves suffered badly from lice in the Second World War on the Eastern Front, especially in the Battle of Stalingrad. "Delousing" became a euphemism for the extermination of Jews in concentration camps such as Auschwitz under the Nazi regime.

In the psychiatric disorder delusional parasitosis, patients express a persistent irrational fear of animals such as lice and mites, imagining that they are continually infested and complaining of itching, with "an unshakable false belief that live organisms are present in the skin".

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Control of Gnats

Adult non-biting gnats do not damage plants but are considered a nuisance. Usually, larvae do not cause serious plant damage, but when present in large numbers can stunt the plant growth and damage its roots. To prevent gnats from spreading, measures have to be taken to target immature stages of development of the species. Physical tactics include eliminating favorable living conditions: reduction of excess moisture, drainage of pools with standing water, and removal of decaying organic matter. Commercially available control agents and insecticides can be used as a control measure, but are not recommended for use in a household. To control adult gnats in smaller areas, pressurized aerosol sprays with pyrethrins can be used. Other control measures in the household can include turning off unnecessary lights at dusk and sealing vents and other openings.

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