The collecting of seashells.

The action or practice of searching for or collecting insects or other bugs (bug, n.2 1), esp. as entomological specimens.

The branch of knowledge that deals with birds' eggs, esp. in regard to their external appearance; a description of birds' eggs; the practice of…

love of books, taste for books.

The action or practice of searching or shopping for antiques, esp. as a pastime; antique collecting.

The pursuit of collecting, arranging, and studying cigarette-cards and similar items.

The hobby of collecting postcards.

The collecting of matchbox labels or matchbook covers.

The collecting of beer mats.

The study or collection of banknotes.

The hobby or pursuit of collecting old bond and share certificates.