TY JOUR TI MORPHOFUNCTIONAL STUDIES OF THE RESPIRATORY, DIGESTIVE AND URINARY SYSTEMS IN BIRDS KW birds KW lungs KW air sacs KW esophagus KW stomachs KW liver KW kidneys KW ureters JO Vestnik of Omsk SAU AU FOMENKO, L.V. AU DIKIH, A.A. AU PERVENETSKAYA, M.V. PY 2025 IS 60 PB FSBEI HE Omsk SAU