The spelling is "monarch butterfly" (plural "monarch butterflies").
No.
The word queen has a normal plural, which is queens.
The royal "we", or majestic plural is the use of a plural pronoun to refer to a single person holding a high office, such as a sovereign (e.g., a monarch or sultan) or religious leader (e.g., the Pope or a bishop). It is commonly employed by a person of high office, such as a monarch, earl, or pope. It is also used in certain formal contexts by bishops and university rectors.
the monarch butterfly
monarch butterfly
The noun 'subjects' is the plural form for the singular 'subject'; a common, abstract noun; the person or thing that is being discussed, described, or dealt with; a person ruled by a monarch.
Monarch butterflies start their lives out as caterpillars. A 'baby monarch' would be a monarch caterpillar. Monarch caterpillars striped black and yellow along their back.
aztec monarch
chase monarch
monarch
A monarch butterfly. There is no Monarch butterfly silly!