Belle Vue was the first privately financed zoo in England, and grew to become the third-largest in the UK. Jennison's original idea was that the gardens should be primarily a botanical excursion, but it became clear that the public was interested in the animals as an attraction in their own right. The initial collection had consisted of domestic birds and a few exotic parrots, but Jennison probably also acquired those animals that could not be sold after the Manchester Zoological Gardens closed in 1842. By 1856, the Jennisons had added kangaroos, rhinos, lions, bears and gazelles.