HARARE, Zimbabwe — The cave squeaker is back.

Researchers in Zimbabwe say they have found a rare frog that has not been seen in decades.

The Arthroleptis troglodytes, below, also known as the cave squeaker because of its preferred habitat, was discovered in 1962, but there were no reported sightings of the elusive amphibian after that. An international “red list” of threatened species tagged them as critically endangered and possibly extinct.

Robert Hopkins, a researcher at the Natural History Museum of Zimbabwe, in Bulawayo, said his team had found four specimens of the frog in its known habitat of Chimanimani, a mountainous area in eastern Zimbabwe.

The research team found the first male specimen on Dec. 3 after they followed an animal call they had not heard before, Mr. Hopkins said. They then discovered two other males and a female. Mr. Hopkins said he been looking for the cave squeaker for eight years.