The incident began on August 6.
As of August 21, 65 burros have been trapped, 49 have been shipped and no deaths have occurred, according to the gather page.
The capture total includes 28 jacks, 28 jennies and nine foals.
Youngsters represented 13.8% of the animals gathered.
The herd can’t be growing at a rate of 20% per year with a birth rate of 14%.
Of the adults, 50% were male and 50% were female.
The location of the trap site is not known but the burros are associated with the Cibola-Trigo HMA, which overlaps the Yuma Proving Ground.
Day 16 ended with 16 unaccounted-for animals.
The capture and removal goals are 80 each according to the latest schedule.
The roundup was not announced at the BLM news site.
RELATED: YPG Roundup in Progress.