On “send away”: that’s the actual release action — if you don’t tap it, the bird stays in a pending state and can resurface, which sounds like exactly what’s happening to you (and to ShinyLeftPad below, reopening the site in the same browser brings back a bird that was never sent away). We agree the button isn’t obvious right now and that’s worth fixing.
On bots / non-human birds: it’s a real concern for us too, and we’re thinking about how to discourage that without compromising anonymity. No solution yet, but it’s on our radar.
The feed icon visibility, the long list of fed birds feeling insignificant, the idea of replies/comments on birds, and cleaning up the translated text — all noted, we’re not solving these in this thread but they’re captured for the next round of work.