Searched it up cause I was curious too. It's the white tern, and according to Wikipedia, the egg does roll off frequently. The bird simply doesn't care and lays another egg
Yes, Wikipedia mentioned that they fall too. The article mentions that the hatchlings have wide feet to help lessen the chances that they fall
Baby bird: I had to evolve and adapt because my parents don't care about me.
Parents bird: Lol, STFU duck-feet loser
As long as more eggs are hatched than fall, it works.
Though, “your parents dropped you as an egg” jokes seem… appropriate,
Eh, now we’re getting into when is it a bird…
(Sorry, sorry.)
But as long as you have one or two eggs hatching, it doesn’t matter if a couple dozen fall.
Or more.
“If it’s stupid, but it works, it ain’t stupid.” - that bird.
“You learned that from your parents, didn’t you?”- weaver birds.