 Androgenic steroids are known to affect the growth and formation of bones, and a connection is possible between this species-specific trait and the "male" genital apparatus in female moles of many mole species (gonads with testicular and ovary tissues).A mole's diet primarily consists of earthworms and other small invertebrates found in the soil.The mole runs are in reality "worm traps", the mole sensing when a worm falls into the tunnel and quickly running along to kill and eat it.