Elizabeth Preston

I don't know if your collar has tried that.

In the poison frogs I was talking about earlier, you know, the dad gets the babies to wriggle up onto his back for a ride.

And there is definitely urgency there because if they don't do it in a timely manner, they'll desiccate and, you know, die.

So maybe the collar could suggest that to their child.

You know, you don't want to dry out.

And then sometimes the babies don't want to get off the dad's back.

And so he will use one of his legs to kind of flick the baby tadpole off into its pool.

There are a lot of bird species that have a strategy called an insurance egg.

One example is the blue-footed booby.

which a lot of people are probably familiar with.

They have those blue feet, looks kind of like a seagull.

And the idea is that in a good season with a lot of resources, the parents might have the ability to raise two chicks.

But if it turns out that there's not quite as many resources available as they thought, they're only planning on raising one.

And so, you know, in some species, this means the parents will have to actively toss the chick out of the nest.

In the blue-footed booby, what they do is let the siblings kind of duke it out.

And so...

They do, they wait the fight unfairly by having one of the eggs a little bit sooner than its sibling.

So one of the birds hatches before the other one and it is bigger.

And so that sibling has an advantage.

And if there isn't enough food to go around, the bigger sibling will just bully the littler one until it dies.