For me, it's aardvarks that show just how good termites are as an energy source. The digging one aardvark can do in a night is quite surprising. As a kid I remember crawling through some of the holes an aardvark had dug into termite nests in our garden; a tunnel big enough for a 7 year old to crawl through dug in an hour or two just to get at the termites below...