I didn't have time to find what they had come for, but later at the Visitor's Center one of the farmers mentioned that a dead deer had been spotted down in the far fields.
Vultures aren't the most popular birds among birdwatchers, but they provide an important service on the farm and in the ecosystem: cleaning up, not to mention recycling nutrients.
English Language Fact of the Day: A group of vultures in flight is called a kettle. Vultures at rest are called a committee, venue or volt. Vultures feeding are called a wake.