A lesser known revenue which fits the topic is the Rome, Georgia, Beer Tax stamp - a virtual paradise for the topicalist. Searching a catalog will not give you this information, but the Dogs on Stamps Study Unit's handbook will mention this very scarce stamp. Information may or may not give you what you want in the search. It may take hands-on effort in hunting through the stamps themselves, sometimes with a magnifier. To attempt to give equal time to the cat collector, there are no revenue stamps for the domestic cat, but big cats do show up on a few revenues of the Far East.
Straits Settlements do feature tigers on some of their revenue issues.
Trains are found on many revenues from Hungary, Austria, China, Argentina and others. Bees are seen as decorative devices on some French revenues and beehives show up on Hungarian issues. Flowers are found on revenues from many countries, even some that didn't start that way. K. Bileski overprinted the revenues of Saskatchewan with flower motifs to prevent flooding of the market with excess mint copies of an otherwise scarce issue. Mythological characters are often portrayed and royalty is a dime a dozen.