Whitsun hatchling sizes?

Unless i keep missing something, it seems like many of the Whitsun creatures’ descriptions make no indication of size. Is there official information on this? E.g. are the Squirrels generally squirrel-sized? Or maybe only the Quizzical one is, whereas the Acicular double the size, etc?

I think the squirrels are squirrel-sized. The Spindlewolves are probably wolf-sized, too, just with veeery long legs…