Not getting snotty, just stating facts....could have included pics of scoters choking down clams, and ring-necks apple snails...
Only choking cases I know of involve fish when the spines stick in the esophageal lining. There's a difference between concern and paranoia. We all are concerned...
I will quote from "Avian medicine:principles and application, authors Ritchie, Harrison, and Harrison 1994" "...however, plant intoxications are rare. Free-flying companion birds encounter and consume a variety of plants found in the home...., some of which are thought to be toxic and some are...
I always ignore those lists. Many plants listed may be toxic to mammals, but not birds....for example....birds love lantana fruits.... they are a bird dispersed species....if the sugars in a fruit are sucrose...thrushes will starve because they lack sucrase to digest it....give Chinese tallow...