New testing underway to discern unknown ailment killing wild horses in Waipio Valley

  • A wild horse grazes in the lush Waipio Valley. (Image capture from YouTube video by Aramat Equine Services/Special to West Hawaii Today)

  • An emaciated wild horse has trouble standing as its illness is affecting its rear legs. (Image capture from YouTube video by Aramat Equine Services/Special to West Hawaii Today)

  • One of Waipio Valley’s wild horses attempts to graze despite being sick. (Image capture from YouTube video by Aramat Equine Services/Special to West Hawaii Today)

  • A group of veterinarians examines an ailing member of Waipio Valley’s wild horse population. (Image capture from YouTube video by Aramat Equine Services/Special to West Hawaii Today)

KAILUA-KONA — No one knows how many wild horses in Waipio Valley have perished, or what is killing them.