It is a very important fact in shorebird biology that most beach nesting birds get very easily disturbed by people and dogs walking past them and will leave the nest whenever such disturbances come too close. When the birds are meant to be looking after the eggs, but spend most of their time running away from big scary things it results in problems (as in, the eggs never hatch). But, if you think about it logically, it doesn't make sense:
- Shorebirds nest in summer
- Summer is hot
- Shorebirds nest directly on the sand
- Sand in summer is very, very hot
- A bird sitting on the eggs will only make them hotter
- Hot eggs cook
Turns out I was right. Birds do shade their eggs, but it isn't all they do- they do this amazingly cute thing called "belly-soaking"
"Belly-soaking" is when a parent bird notices that the eggs are too hot, runs from the nest into the water up to its belly, gets its tummy feathers all wet, runs back to the nest, and puts its now cold and wet tummy on the eggs. During hot days the birds do it almost constantly so its very time consuming and energetically expensive for them, but its also very effective. And cute. So very, very cute. I was rapt when I found that the answer to the question that had been bugging me was so simple and so cute. Now I love my birdies even more :)