Harridans

A Harridan (Avius terriblis), also known as the Brooding Mother, is the largest flying Tyranid bioform the Imperium of Man has yet encountered in its bitter war against that inter-galactic alien menace. Circling high above, soaring on the warm thermals of battle on its great outstretched leathery wings, the Harridan waits patiently before diving down over the battlefield, strafing its foes with Bio-Cannons or swooping low to rake a tank with its two massive claws, or snapping its massive fanged jaws around an infantryman.