music: Bono, The Edge, Adam Clayton; name the fourth member of this band?

Questions

---------- chinchillas were brought from the Andes Mountains in South America in the 1930's. All chinchillas presently in North America are descended from these ---------- chinchillas.?

Baby mink are born blind and remain sightless for a ----------?

Baby opossums - upon birth when they move to the mother's pouch - are smaller than honeybees. An entire litter can fit in a ----------?

A rhinoceros has ---------- toes on each foot.?

A robin has nearly 3,000 ----------?