The solution to a puzzle hint referencing creatures inhabiting the Earth is typically a noun. This noun describes the collective existence or realm of fauna. For example, a crossword clue stating “creatures great and small” might lead to the answer “ANIMALLIFE”.
Successfully deciphering this type of clue requires a broad understanding of biological terms and a familiarity with common crossword conventions. Correctly answering such a puzzle component exercises the mind and expands vocabulary. Historically, such puzzles have provided entertainment and intellectual stimulation.