Andrea Zanoni, regional politician in Veneto in northeastern Italy, draws attention to a film clip from the trip that has been published on a media platform run by the American president's son.
Several people are seen shooting and killing various ducks – including a ferruginous duck. The ferruginous duck (Tadorna ferruginea) is not considered globally endangered, but its population has decreased in Europe and is considered to be threatened.
The species is protected by the EU's Bird Directive and Italy's animal protection laws. Killing a ferruginous duck is therefore a crime, notes Andrea Zanoni.
The film clip has been published by Field Ethos, which Donald Trump Jr has founded and markets as a lifestyle publication for men who like adventure and hunting and do not apologize for themselves.
A good morning, many mallards and teals, says Trump in the clip, then points to a reddish-brown duck lying among several dead ducks.
This is actually a pretty rare duck for the area. I'm not even sure what it's called in English.
The hunting location is said to be located in the Venetian Lagoon south of the city of Venice itself.
Andrea Zanoni, who represents the Green party Green Europe, says he has reported this to the authorities. The case has not yet been handled.