Sentences with phrase «smaller than rats»

Because mice are so much smaller than rats and can escape through wire bars that aren't close enough, glass tanks with climbing toys can work well for them.

The only mammal - like critters were usually smaller than rats, and they scuttled through the underbrush chasing insects.

Not exact matches

«It's a small mammal species smaller than the regular rabbit and larger than a rat,» Khadka says.

Today, lab mice live in shoebox - size cages hundreds of thousands of times smaller than their natural ranges, and rats can't forage or even stand upright.

The team found a smaller aura of activity originating from the curved dentate gyrus than in normal rats [see image below].

Studies in the 1960s and 1970s showed that rats and humans who can't predict a negative effect (such as a small shock) end up more frazzled than those who can predict when a zap is coming.

The neonatally infected rats were smaller than normal rats and more hyperactive, but they didn't die and they didn't have movement disorders.

Researchers placed a small harness around rats and put them on a treadmill surrounded by a «virtual world» on large video screens — a virtual environment they describe as even more immersive than IMAX — in an otherwise dark, quiet room.

In rodents, differences in life expectancy and morbidity during aging are particularly high: Despite close relationships with regard to genetic aspects, small rodents like mice or rats live no longer than two to three years, whereas mole - rats or chinchillas have an average life span of 20 to 30 years while staying comparatively healthy.

Warfarin - resistant rats are usually smaller and lighter than susceptible rats from the same populations.

Hanna and Cardillo also found that rats» impact was most pronounced on small mammals — those weighing less than 2.7 kilograms — although the scientists are unsure how much of this influence was due to direct predation as opposed to competition for food and other resources or disease spread.

But because the vinclozolin - induced fertility changes occurred in almost every male rat descended from a treated mother rather than in a small percentage of offspring (as is seen in germ line mutations caused by radiation), Skinner suspects an epigenetic mechanism — a change that doesn't mutate the DNA sequence of an animal, but rather affects how genes are expressed.

The lateral ventricles were also larger in 3 - NP rats, although iPSC treatment at any time reduced the size, and the 3 - NP - iPSC - 7 and 3 - NP - iPSC - 42 rats had ventricles smaller than sham rats.

The kidneys of the Han: SPRD - cy rats in the hemp and soya groups had less fibrosis and smaller cysts than the rats that had been given casein or pea protein.

In 1920, Osborne and Mendel showed that rats consuming a diet containing only 0.3 percent fat consumed more food and grew more vigorously than rats on a standard diet and concluded that «if true fats are essential for nutrition during growth the minimum necessary must be exceedingly small.»

In the early days, it was the imported Siberian sled - dogs, sometimes referred to as Siberian rats because of their lighter body structure and smaller size than the Malamutes and mixed breeds traditionally used in Alaska, that soon won fame and success - not only as very fast competitors in the grand sled - dog races of the gold - rush era, but also as couriers of mail, and even of vaccines which saved human lives (one very famous instance of which, is remembered through the classic Iditarod race).

From neonatal kittens, puppies with ringworm, or pets with injuries and medical conditions — to small companion pets like rabbits and rats, and adult dogs and cats needing an environment other than the shelter — hundreds of foster families opened their hearts and homes to thousands of pets from our shelter this past year.

Pet rats are also omniverous and will prey on animals smaller than them, so it is not safe to introduce your pet rat to a hamster or another smaller animal.

Most of us would probably prefer to have a small, healthy feral cat population, rather than a larger Norway rat and seagull population in habitats where those are the only options.