And from the research that you've looked into, what are some of the threats that bank swallows face?

I mean, a lot of it is just really the insect population.

They might be considered an indicator species where as the insect population has declined, so has the population of all aerial insectivores.

So bank swallows, along with anything that hunts insects, their populations are declining.

One of the threats to them is that they basically more or less need erosion to live.

Like they've done studies in California where they did some bluff remediation along the coast and bank swallow population wasn't doing too well.

So then they removed the bluff remediation, basically allowing the bluff to erode more.

Like, how did you get video of what was going on inside a bank swallow's nest?