it dosn't work because the first animals most eople think of with sonar is Dolphin or Bat. I guess wally could have specified "land mammal", but he'd be to lazy!
Maybe, but for 25% of the planet it should also be in Mandarin or Cantonese, which is rather more than the percentage of the population whose first language is English, so let's not get too hung up on the units, eh?