What small cap is worn over the fingertip for protection while sewing?

Which small Basque town was immortalized in a 1937 Picasso painting? Which small bird comes in house, cactus and rock types? What word names a small bit of snow, soap or cereal? What word for a bell tower is proverbially home to bats? What word names a small car or a small mirrored makeup case in a handbag? What word names a small cave, like the famous "blue one" on Capri? A small chapel in a village northwest of Moscow marks the source of which river, more than 2,000 miles long? What is a small cucumber preserved in vinegar or brine called?