The other type of cacti are jungle cacti, and they do need humidity. These plants are more succulent-looking, and lack real spines, similar to 'Christmas' cactus. If this is the type you have, they like a bit more water, and during spring and summer, water plentifully to keep the potting mixture thoroughly moist.
There are about 3-4 million animaks euthanized each year by shelters. There actually are about 4-6 million animals euthanized in shelters in America each year. The above are just estimates. Shelters don't always keep accurate records, and no thorough surveys have been done. No one knows the real numbers.
Click to see the number of animals used per year The number of animals used in experiments dropped away steadily between the 1970s and 1990, but has more or less levelled off in the past 15 years. Since 2001 the number of procedures using animals has risen slightly every year. The latest figures available show 2.8 million procedures using animals were recorded in 2003 - about half the number carried out in the early 1970s. The vast majority - 85% - used in tests are specially bred rats, mice and other rodents.