List In List

• Mammals
  1. dog
     1. collie
     2. dashshund
     3. poodle
  2. cat
     1. persian
     2. calico
  3. pig
• fish
  1. trout
     1. brown
     2. rainbow
  2. brook
  3. gold
• insects
  1. ant
  2. grasshopper
  3. fly
• birds
  1. blue
  2. eagle
  3. quail
  4. robin