Niltava or Rufous-bellied niltava is a species of bird in the family Muscicapidae. Tropical Passerine Bird Cartoon flat style beautiful character of ornithology, vector illustration isolated on white Niltava or Rufous-bellied niltava is a species of bird in the family Muscicapidae. Tropical Passerine Bird Cartoon flat style beautiful character of ornithology, vector illustration isolated on white.