Well the moth categories are large enough, both 1992, 2000 and 2006 carry as many as 200+ moths, that's enough for one whole page out of over 500 species being described in those years alone. Its different for World War II era, or precisely the period between 1930's to 1949. Because during those times there was maximum of 100 species described (in total). But after 1950, we see a huge increase in entomology enthusiasm. I know much about beetles categories, but Category:Beetles described in 2006 is the main category which have close to 100 species, and will probably increase. Either way, you should agree (and so the deleter as well), that the Animals category becomes very claustrophobic and difficult to navigate through. Yes, it carries the alphabet, but even with that in order to find a specific species (especially if a user look for moths) is still difficult. By the way, I forgot to thank you personally for your help, its a pleasure to meet someone experienced and new at the same time.