arch atlas bb bengal
berlin brown bull charles
crouching death deficit dollar
donald elvis extra fallen
film fish fishing gamma
gates guardian hook inter
lame larry lima loan
louis mallard manta merlin
mo monaco morgan morning
mosquito murray north oz
panda patrick paul peking
peter phoebe polar pool
prometheus radagast rhea rights
rock rodney ron siberian
silver sofia sparrow sting
teddy tony whale woods
Step 1: Sort the words into 16 groups of four. All of these groups have a one-word title, which is always plural.
Step two: Sort the titles into four groups of four. What is the common theme?