Historical clue formulations

• Swimmers in kelp forests — 2021-08-29
• Creatures that have the densest fur of any mammal (up to 1 million hairs per square inch) — 2021-07-14
• North Pacific carnivores — 2009-03-21
• Abalone eaters — 2005-11-25
• Abalone eaters — 2005-10-29