Answer: lungfish

AnswerCrossword Clue
LUNGFISHDipnoan.
LUNGFISHFreshwater creature that breathes air
lungfisha type of fish
lungfishAn elongated freshwater fish with one or two sacs that function as lungs, enabling it to breathe air. It lives in poorly oxygenated water and can estivate in mud for long periods to survive drought