Under the savannas of South Africa, there may be as few as 7 worms in every square foot [70 worms in every square meter] of soil, while on a forest floor in Canada, there may be over 70 worms per square foot [700 worms per square meter].
Lõuna - Aafrika savannimuldades elab ühe ruutmeetri kohta vaid umbes 70 vihmaussi, Kanada metsamuldades aga üle 700 vihmaussi.