Do you know how we treat animals?
Well, hundreds of millions of animals are experimented on and killed in laboratories all over the world every year. Some of these experiments include pumping chemicals into rats' stomachs, hacking muscle tissue from dogs' thighs, and putting baby monkeys in isolation chambers, away from their mothers.
Some of these "experiments" have been to remove cats' eyes as part of sight deprivation tests.
In other "experiments", animals' bones have deliberately been broken. Animals have been starved, dehydrated, burnt, poisoned, and electric shocked.

Transgenic pigs have been bred to grow faster and leaner, only to suffer from arthritis, lethargy, abnormal skull growth, and impaired imune systems.

In some experiments, baboons have been subjected to invasive surgeries and left to suffer and die in their cages with no painkillers to ease their suffering.
Monkeys have been forced to endure surgical procedures in which metal pipes were implanted into their skulls for the sole purpose of inducing stress to study the connection between stress and women's menstrual cycles.
Pregnant baboons have been given large doses of nicotine and morphine, had backpacks full of intrumentation strapped to their backs, and were tethered inside metal cages for observation. Their babies underwent surgery whilst still in utero.

Iams, the pet food company, has funded and participated in laboratory experiments on hundreds of animals that have caused kidney failure, obesity, malnutrition, liver damage, severe allergic reactions, stomach inflamation, diarrhoea, severe skin disorders, lesions, skin wounds, and other painful diseases, and animals have been kept in dungeon-like conditions.
Dogs have been force-fed vegetable oil, had chunks of muscle removed from their thighs, and been "de-barked" by having their voice boxes cut out in a painful and bloody procedure.

Experimenters use chimpanzees in AIDS studies because they share 99% of their gene composition with us.
They infect the chimpanzees with AIDS, and keep them locked in small steel-and-glass isolation chambers, driving them insane from stress and loneliness. The stress supresses their immune systems, making accurate AIDS studies impossible.
AIDS studies on chimpanzees are, however, useless anyway, due to the fact that chimps do not develop the disease when injected with the virus.
In case you know nothing about AIDS, here is a little information about it:
The Acquired Immune Deficiency Syndrome is a disease that results from a viral infection that damages the immune system. A damaged immune system cannot protect the body from other infections and cancers, and these secondary illnesses often result in death.
There are at least 10 strains of the AIDS virus, called Human Immunodeficiency Virus (HIV), with different strains existing in different geographic areas. People may carry more than one strain in their bodies.
The origin of the AIDS virus is unknown, however it is similar to a virus found in African green monkeys. There is no evidence to prove that the simian virus caused the human one.
Animal experiments are neither necessary nor useful in studying how AIDS infects or affects humans.

Diseases that are artificially induced in animals in a laboratory are never identical to those that occur naturally in human beings.
Animals are routinely cut open, poisoned, and forced to live in barren steel cages for years, although studies show that because of the vast physiological variations between species, human reactions to illnesses and drugs are completely different to those of other animals.

In this day and age there are a number of more ethical and useful alternatives instead of animal testing.

The way animals are treated is disgraceful, and yet people seem to still tolerate it.
If you heard about this kind of "testing" being done on humans there would be an uproar, but because it's on animals, people don't seem too bothered.

Humans aren't animals, animals don't go to this level of cruelty to other species. They don't treat others the way we treat our own species, even, but I'm not going to go into that right now.