- Wren, Sir Christopher Wren - English architect who designed more than fifty London churches (1632-1723)
--1 is a kind of architect, designer
- wren, jenny wren - and of several small active brown birds of the northern hemisphere with short upright tails; they feed on insects
--2 is a kind of passerine, passeriform bird
--2 is a member of Troglodytidae, family Troglodytidae
--2 has particulars:winter wren, Troglodytes troglodytes; house wren, Troglodytes aedon; marsh wren; rock wren, Salpinctes obsoletus; Carolina wren, Thryothorus ludovicianus; cactus wren