Many animals have 20 or more offspring from one labor work. Like the possum for example. Sorry if this didn't answer your question.
No animal can have twins
No, identical twins do not always share a placenta. In some cases, identical twins may have separate placentas.
fraternal twins have two different chromosomes
Mirror Twins are always monozygote twins. This does not mean that fraternal twins won't be a righty and a lefty - if your family tends to run left handed.
Yes it can.If you have a twin idol every birth will be twins.It is very rare for your animal to have twins without one,but not impossible.
Yes. Conjoined twins are always identical (monozygotic) twins, and identical twins are always the same sex.There is a theoretical case where identical twins could be opposite genders, when the babies are female but in one of the females, a branch of one X chromosome breaks away; however, I don't believe this has ever been observed.
No. The chances of them being the same sex are the same as if they were not twins at all.
Not always.
twins we will always be....
Usually, but not Always. sometimes there are Twins.
fraternal twins can have separate fathers.
fraternal twins have two different chromosomes