Rose comprises an outer fleshy layer, the hypanthium, which contains 5–160 "seeds" (technically dry single-seeded fruits called achenes) embedded in a matrix of fine, but stiff, hairs. Rose hips of some species, especially the dog rose ("Rosa canina") and rugosa rose ("Rosa rugosa"), are very rich in vitamin C, among the richest sources of any plant. The hips are eaten by fruit-eating birds such as thrushes and waxwings, which then disperse the seeds in their droppings. Some birds, particularly finches, also eat the seeds. While the sharp objects along a rose stem are commonly called "thorns", they are technically prickles—outgrowths of
Rose-crowned fruit dove Rose-crowned fruit dove The rose-crowned fruit dove ("Ptilinopus regina") also known as pink-capped fruit dove or Swainson's fruit dove, is a medium-sized, up to 22 cm long, green fruit dove with a grey head and breast, an orange belly, whitish throat, yellow-orange iris, and greyish green bill and feet. It has a pinkish-red crown with yellow border. The Indonesian subspecies, "P. r. xanthogaster", has a whitish crown and paler grey head and breast. Both sexes are similar. The young has a green-colored crown and plumage. The rose-crowned fruit dove is distributed in lowland rainforests of northern and eastern Australia, and