Tame the elk bulls with the Rocky Mountain Matriarch Cow Calf Call! Designed to produce accurate sounds of all cow/calf mews. Rocky Mountain Matriarch Cow Calf Call Steve Chappell Signature Series Features: Elk game call produces all cow/calf mews and nasally sweet estrus sounds. Can produce and imitate the estrus scream. Part of our Steve Chappell Signature Series.