Africanized "killer" bees are a hybrid species known for aggressively defending their hives. Some 90%-100% of wild honey bee colonies in Arizona are Africanized.

The bees were kept inside until late afternoon—just long enough for researchers to observe how wild bees behaved in their absence. “It was a unique experience. Never boring,” Pasquali says.

Africanized "killer" bees are a hybrid species known for aggressively defending their hives. Some 90%-100% of wild honey bee colonies in Arizona are Africanized.

Africanized "killer" bees are a hybrid species known for aggressively defending their hives. Some 90%-100% of wild honey bee colonies in Arizona are Africanized.

Africanized "killer" bees are a hybrid species known for aggressively defending their hives. Some 90%-100% of wild honey bee colonies in Arizona are Africanized.