All common names are automatically shown in capital case regardless of how they entered into the database, however that computer code seems to be failing here.
I suspect there is a hard coded rule in their formatting code to ignore the word and so it appears in lower case in English and that Danish ducks are a casualty of that. If do, it will be closed quickly by the staff as a non bug and intended behaviour.
If or more likely when the devs say yes it is a hard coded rule, is it then possible to change the rule to act on 'and ’ ie with a trailing space. There are I imagine no cases where and is the last word in any English common names and would then fix this.