The thing about science is that things supported by reasonable evidence are incorporated in science and those that are not are excluded. However, evidence and understanding change over time so things accepted by science as true have become known as false, and things once thought false have become known as true. Current science is based on our current evidence and knowledge. The posted study showing that killifish can pass through a water bird's digestive tract and survive makes it likely that this species can colonize new bodies of water via this route. Of special note is how far such transplantation might occur since this particular species seems to have eggs adapted to drying out and withstanding other harsh conditions.
