Belle and Bowie have more than tripled in size since their births in 2013. At 1.5 years old, Belle is 1,612 pounds and 60 inches tall. Bowie is 1,300 pounds and 58 inches tall. As the calves continue to grow, Bowie will eventually pass Belle in height and weight. In 2014, Bowie began to show signs of tusk development, with ivory emerging through his gums. The calves will continue with their behavior training in their second year, and are expected to exhibit more independence from their mothers.