This page offers some rough estimates of the numbers of wild animals on Earth. Collectively, wild land vertebrates probably number between 1011 and 1014. Wild marine vertebrates number at least 1013 and perhaps a few orders of magnitude higher. Terrestrial and marine arthropods each probably number at least 1018.
How long do head lice live? The life span of an adult louse on a host ranges up to 30 days. During this time, the female head louse can deposit about 90 eggs. After incubating for seven to 10 days, the nits hatch and, after another 10 days, mature into adult head lice and the cycle begins again.Off the host, adult head lice can live about two to four days at 74 degrees Fahrenheit (F) and one to two days at 86 degrees.Nits will remain alive off the host for up to 10 days; they will not hatch at or below room temperature (68 degrees F).fter incubating for seven to 10 days, the nits hatch and, after another 10 days, mature into adult head lice and the cycle begins again. Off the host, adult head lice can live about two to four days at 74 degrees Fahrenheit (F) and one to two days at 86 degrees.
They survive longer when on the scalp, but how long can head lice live without body contact? Lice are commonly spread from person to person by sharing personal items such as combs, brushes, hats, helmets, scarves, clothing and headphones. Pets can be a carrier for the lice but the lice cannot survive long on an animal. Females lay up to 400 eggs in their lifespan, which is spaced out to about eight eggs per day. These eggs hatch in one to two weeks. Head lice begin as empty eggs called nits.