How rare is a sloth?

As a keen observer of nature and its inhabitants, I'm curious to delve deeper into the enigmatic world of sloths. Could you elaborate on just how rare these creatures actually are? Do their numbers vary significantly across different habitats or regions? Are there any specific threats that they face that may be contributing to their rarity? Furthermore, how do conservation efforts currently stand in protecting these fascinating yet elusive animals? Lastly, what role can the general public play in safeguarding the future of the sloth population? Your insights would be greatly appreciated.