We can not tell the exact number of animals in the manger. But it is quite possible that there were a few animals there.
I dont think that it is mentioned in The Bible that there were any animals present at all. However Mary did arrive in Bethlehem on a donkey so it seems viable they would have taken it into the "barn" with them. Also, since many people believe it was around Winter time that Jesus was born, all animals would have been kept in shelters to keep warm. But like I said before, I do not think the Bible say's that there were any for sure.
**Fun Fact** Many people believe that the Wise men arrived shortly after Jesus's birth, as the shepherds did, but they actually showed up years later after Jesus was already 2 or 3 years old!
A manger is like a feeding trough
The manger is only the cattle shed where all the animals were kept to protect from the cold and wild animals.
A manger is a wood, metal, or stone basin used for feeding animals.
Bulls, cows, horses, donkeys, lambs, and goats are all examples of animals that eat from a manger. Since many animals are able to eat from a manger, there are quite a few, though the ones above are the most prominent.
In the manger in Bethlehem , there were Joseph , Mary and the animals were thee like sheep, ox and cows were there.
A manger.
Manger, which is a trough for animals to feed out of.
A manger (French - manger - to eat) is used to store hay and animal fodder. The animals (cows) were lead in to the manger in the evening to eat and possibly to be milked at the same time. They were then shut in, or into the byre, for security during the night.
A manger is a trough or box used to hold food for animals, typically feeding troughs used for livestock. In a religious context, it refers to the feeding trough where Baby Jesus was placed in the Christian nativity story.
a manger is also known as a crib, trough. It can also be like a box where in farming, food for the animals is poured to feed them.
The English words "manger" and "stable" both ultimately come from Latin. "Manger" comes from the Latin word "mangarium," which means "eating place for animals." "Stable" comes from the Latin word "stabulum," which means "shelter for domestic animals."
A manger was Jesus' crib, for as the angels declared to the shepherds: "and you shall find the babe wrapped in swaddling clothes and lying in a manager", which basically an animal feeding troth.