York University Researchers Test Genetics Of African Hybrid Honey Bees (video) York University Share Print E-Mail Loading video... Caption The York University research team measures the defence response of 116 Brazilian AHB colonies using the Suede Ball test. A suede ball is gently swung for one minute in front of the colony entrance stimulating a defense response. Credit Samir Kadri, a former York visiting PhD student Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.