(1) Indian Runneris a breed of thedomestic duck. They stand erect likepenguinsand, rather than waddling, they run. The females usually lay about 150 to 200 eggs a year or more, depending whether they are from exhibition or utility strains. They were found on theIndonesianislands ofLombok, Java, andBaliwhere they were 'walked' to market and sold as egg-layers or for meat. (6) The ducks vary in weight between 1.4 and 2.3kg (3.1 and 5.1lb). Their height (from crown to tail tip) ranges from 50cm (20in) in small females to about 76cm (30in) in the taller males. Indian Runner ducks have a long, wedge-shaped head. The body is long, slim but round in appearance. (10) They often swim in ponds and streams, but they are likely to be preoccupied foraging in grassy meadows for worms, slugs, even catching flies. When they are young, they eat rocks to form their gizzard which helps them digest their food. They do not have teeth, so they must have water to soften food. (Taken from https://en.wikipedia.org/wiki/Indian_Runner_duck, with some editing) What is the main topic of paragraph 2?

Question

(1) Indian Runner is a breed of the domestic duck. They stand erect like penguins and, rather than waddling, they run. The females usually lay about 150 to 200 eggs a year or more, depending whether they are from exhibition or utility strains. They were found on the Indonesian islands of Lombok, Java, and Bali where they were 'walked' to market and sold as egg-layers or for meat.

(6) The ducks vary in weight between 1.4 and 2.3 kg (3.1 and 5.1 lb). Their height (from crown to tail tip) ranges from 50 cm (20 in) in small females to about 76 cm (30 in) in the taller males. Indian Runner ducks have a long, wedge-shaped head. The body is long, slim but round in appearance.

(10) They often swim in ponds and streams, but they are likely to be preoccupied foraging in grassy meadows for worms, slugs, even catching flies. When they are young, they eat rocks to form their gizzard which helps them digest their food. They do not have teeth, so they must have water to soften food.

(Taken from https://en.wikipedia.org/wiki/Indian_Runner_duck, with some editing)

What is the main topic of paragraph 2?