Once Blathers arrives, however, donation collection duty will pass over to him. Simply visit the owl in either his tent or the Museum and, when talking to him, select the option 'Make a donation.' You can donate multiple items at the same time.

Should you sell duplicate fossils in Animal Crossing?

You should donate your first fossil rather than sell it to one of Animal Crossing New Horizons' Nooks. Whenever you get a brand new fossil that you haven't dug up before, it's best to donate to Blather so you can add to the Museum (which is by far the best building in the game).

Why won't blathers take my octopus?

Blathers won't accept any sea creature donations until you've donated at least one fossil to him. ... If you've already given Blathers a fossil and he turns a sea creature down, it's because you've already donated that species of animal.