Bestbait Butterworms, Butter Worms, Tebo Moth Larvae Bestbait Butterworms are the larval stage of a Trevo or Tebo Moth. We import over 9 million butterworms a year directly from Chile. Butterworms are an excellent live bait but are also desired for pet feeders because of their high calcium and low fat ratio. Bestbait Butterworms typically measure 1/2 – 1 1/2″ in length. They are a orange-yellow color and have a slightly oily feeling. They smell sweet and this is why they are called Butterworms. Bestbait Regular Butterworms are 1/2 ” – 1 1/8″ in length. Bestbait Jumbo Butterworms are 1″ – 1 3/4″ in length. Bestbait Butterworms are packaged in wheat bran which is used as bedding only.