I bet those watermelons have seeds, too, as nature intended. Those who haven't been to the US couldn't imagine how difficult it is to find watermelons with seeds in them.
Discussion
I have never been in US. So your watermeloun does not have any seed? 😳
Seedless fruit is big in the States. Seedless: grapes, watermelon & lemons especially. When I was living in Europe, I was so relieved to not have to search for regular, seeded fruit since seedless isn't a thing there. Enjoy the travels!