Please refrain from adding red links and redirects to this navbox unless you intend to create an article on the object linked. Per guidelines on red links, "Red links may be used on navigation templates with links to existing articles, but they cannot be excessive. Editors who add excessive red links to navboxes are expected to actively work on building those articles, or they may be removed from the template."
Collapsible option
This template's initial visibility currently defaults to autocollapse, meaning that if there is another collapsible item on the page (a navbox, sidebar, or table with the collapsible attribute), it is hidden apart from its title bar; if not, it is fully visible.
To change this template's initial visibility, the |state=parameter may be used:
{{Hydrus|state=collapsed}} will show the template collapsed, i.e. hidden apart from its title bar.
{{Hydrus|state=expanded}} will show the template expanded, i.e. fully visible.
