Ruby: Hash rearranging with pigeons

pigeons.rb

pigeon_data = {
  :color => {
    :purple => ["Theo", "Peter Jr.", "Lucky"],
    :grey => ["Theo", "Peter Jr.", "Ms .K"],
    :white => ["Queenie", "Andrew", "Ms .K", "Alex"],
    :brown => ["Queenie", "Alex"]
  },
  :gender => {
    :male => ["Alex", "Theo", "Peter Jr.", "Andrew", "Lucky"],
    :female => ["Queenie", "Ms .K"]
  },
  :lives => {
    "Subway" => ["Theo", "Queenie"],
    "Central Park" => ["Alex", "Ms .K", "Lucky"],
    "Library" => ["Peter Jr."],
    "City Hall" => ["Andrew"]
  }
}

pigeon_list = {}

pigeon_data.each_pair do |attribute_name, attribute_hash|
  attribute_hash.each_pair do |attribute, name_list|
    name_list.each do |name|
      pigeon_list[name] ||= {}
      pigeon_list[name][attribute_name] ||= []
      pigeon_list[name][attribute_name] << attribute.to_s
    end
  end
end

p pigeon_list