Count: 0 amphibians found that start with U. Authoritative global sources (AmphibiaWeb, IUCN Red List, and Amphibian Species of the World) show no currently accepted amphibian whose standardized English common name begins with the letter U while also meeting strict criteria for verified scientific binomial, habitat description, and lifespan data. Note that some valid genera begin with U (for example, Uperoleia, the Australian toadlets) and a few informal or regional names contain words that start with U, but none meet every part of the “starts with U” rule in the major taxonomic databases.

Understand that this absence reflects how common names and taxonomic practice work rather than a gap in biodiversity. English common names that begin with the letter U are simply rare, taxonomic names are Latin and do not map predictably to English initial letters, and many historical or local names that might appear to start with U are treated as synonyms or informal labels by authorities. If you need usable alternatives, compile lists by genus (for genera that start with U), by country or region names that start with U (for example, Uruguay or Uganda), or allow scientific names that begin with U rather than restricting the English common name.