LOL, they just do that. We lived on a lake when I was young. My mom would get up and walk the yard in the mornings and I was Mama's boy, If she dug I dug, if she planted I planted, if she pulled weeds I pulled weeds, if she waded in the water to get new duck eggs, I watched and let her get muddy! I was in charge of keeping the bucket ready so she could put the eggs in from her petty coat. LOL We wouldn't mess with the actual nest, those were off limits! But the ones on the edge in the water if you got them early in the morning and checked for them everyday they would be fine for eating. I guess kind of like gathering chicken eggs.
My Mom got me started in gardening and ponding. Our first pond was more just a Big water fall that water was sucked from the lake pumped up the hill and came out through a VERY large water fall that lead back to the lake. No fish, just water and plants and a large Lily in one of the holes before it went back into the lake. I remember one morning we found about 8-10 eggs or so in the bottom of the lily bowl, Mama was going to get them but the sides were to slick, so she held my feet while I grabbed them, She lost her grip, I went head first into the lily bowl but I got Dem der eggs! But that was the last time Mama held my feet near any water!