Whenever I see this picture I think of this:
| Creature | Swims | Walks | Flies |
| -------- | ----- | ----- | ----- |
| Dog | X | X | |
| Fish | X | | |
| Bird | | X | X |
| Duck | X | X | X |
Notice how for each combination of swimming, walking and flying, there is a living creature that can do just that, with the exception of swimming and flying.
Sure there are flying fish, but they glide rather than fly. Did evolution really forget to cover this niche?
Cormorants don’t walk well… Their legs are set far back on their body for more efficient swimming.
I think this and loons are the closest to what I’ve been searching for! I even found a video of a loon having to be rescued because it’s unable to walk.
Loons are another one.