Because they only have eight legs and have to put them somewhere.
Edit: Spiders that carry babies on their backs do so because they are hunters. Some spiders don't make webs; instead of building a trap and waiting, they ambush and capture their prey. The safest place for babies with no sac or web, is close to their mother, where they can be fed and kept safe.
Many varieties of spider do this, in many different countries. One example is the huge Goliath Spider, that lives in the rainforests of Brazil and is one of the largest spiders known- but there are many other sorts that do as well, from tiny ones right up to big bird-eating spiders and tarantulas.
Koalas are mammals, a species known for caring for their young for extended periods after birth.
Because an infant may be to weak to walk over the long distances that is required to find food. Often times, the young Chimps will cling to their mother's underside as well.
100's
fornite battle pass
Window spider
Spiders keep their webs as long as they are alive.
they keep their babies for 2 years until they are grown up enough to hunt and fend for themselves
6 months
3 months
9 and a half centries
Yes, as long as you keep it below 500mg.
Once the female gives birth, the male should only put back to her if you plan on using them for breeding again.
Um... At least a month and a half. If the male is showing signs of aggression toward the babies you should keep the male in a separate cage.
the red back spider can live up to 1 year to 3
They are 6-20 millimeters :) DOnt forget to keep a smile on your face at all times
An infinite amount of people as long as we keep making babies.
Gestation for the cheetah id nearly 3 months long - 90-93 days.