You can connect Mastodon through to Bluesky and vice versa using Bridgy Fed so you can get the best of both worlds (that’s for users that turn that bridge on for their accounts, it’s opt in—If you choose Bluesky, please do turn it on, by following @ap.brid.gy).
You’ll see my iNaturalist tagged posts on that Bluesky feed above, but they’re all from me being active on Mastodon. It’s the way an open social media ecosystem should be working.
I doubt “inaturalist.bsky.social” is an official account, it is remarkably empty and not even verified. Looks more like a placeholder/namesquatting account.