“母兽”用英语怎么说？

卵最后在母兽的育儿袋内孵化了.The eggs eventually hatch inside the mother's pouch.怀孕的母兽总是生下一双幼兽,一公一母.Pregnant females always give birth to twins: a female and male.母兽一直都在窝边守护着仔兽的安全.The mother animal constantly safeguards her baby....