Because fluffy

Fluffy hamburgers

That's what I was gonna say! Great minds think alike ;)

I don't know how "great" these minds are

Or they brushed the cow so it looked fluffy and not scraggly

That is not possible. And they are to clean. It's super hard to keep a cow clean, trust me.

But the curly ones are highland cows, and they are real, and very cute :)

The fluffy cows have just been shampooed and dried which cause cuteness in most cows