syntax of the description or context?

I'm unsure what a "hay picker" is! Haybine, hay baler, hay rake, dump rake, bale elevator, bail hook, hay mower, sickle mower, hay crimper, hay chopper, hay rack, hay wagon ... are the immediate words I have as a person who grew up on an Iowa Dairy Farm. I baled hay from age 7 to 27+ ... so "hay picker" doesn't describe any tool i know of?

Corn Picker - Yes, Combine - Yes,

so help me out .. :)