As the smallest otters among the 13 otter species, Asian small-clawed otters weigh 6 to 12 pounds and measure 2 to 3 feet long, half of which is their tail! With at least 12 different vocalizations, each whistle, buzz, twitter, chirp or staccato chuckle that an Asian small-clawed otter makes has a distinct meaning, such as alarm, distress, greeting or mating calls. A huffing sound is typically the parents calling the pups to follow them.