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?
Genus Chrysopelea, commonly referred to as flying snakes. Most snakes are perfectly fine swimmers, so I bet that Genus can swim as well.
I personally can’t wait for the snakenado trilogy to come out
You have to take a restrictive definition of “walk”, though.
huh, is it restrictive to say that you need some number of legs to be able to walk?
In this context, one way of looking at it is just propulsion against the ground vs. through the air or through the water. By that definition snakes, or even something like snails, are walkers.
And, for what it’s worth, even if you require legs there are edge cases. Is inchworming a kind of slither, or a kind of walk?
That’s pretty cool and also quite scary!