A long time ago I made a post about useful Facebook identification groups. For me, those groups are a great resource when trying to ID things you don’t know.
However, there are some flaws: not everyone on that type of groups is a specialist, some people tend to provide IDs even if they’re not sure about it, etc.
So, as a further step on my quest to find good online resources that help ID organisms, I’m interested in knowing which materials do you usually resort to (whether it is a website, a free ID guide made available online or any other kind of resource). This post could be useful for other users in the future, so all recommendations for all taxonomic groups are welcome.
What are your go-to resources?
PS: if you have suggestions on ID guides that may not be freely available online, feel free to suggest them as well