Can only males be Druids?
No, while some have made this claim there are simply too many references to females Druids to allow that claim to be considered tenable in any way. Priesthood in Comhaltacht Draiocht like most other modern Druidic organizations is extended based on issues of education, piety and ethical character without regard to sex or race. A Priests are called Draoi, a priestess is called Bandraoi with no general positional or authoritative differences.