Because they can. Why does it matter to you?(:
A crickets ears are two small white dots found one on each leg near the bend of the knee.
The chirp is made by rubbing their left forewing against their right forewing.
Short horned grasshoppers have ears in the sides of the abdomen. Long-horned grasshoppers & crickets have ears in the knee-joints of their front legs.
"Crickets have tympanic membranes located just below the middle joint of each front leg (or knee). This enables them to hear another cricket's song." ~ Excerpted from the article at Wikipedia , see related link below .
their legs
so that they can hear the predetors
They have ears on their "knees" or where they bend their hind legs.
Yes
Red Knee Tarantula like other tarantula eat insects or feeders. Feeders might be cockroaches or crickets.
The insect that has ears on its front legs are crickets.
A cricket's ears are on its front legs, just below the knees and they have four acoustic inputs.
Crickets (and other insects) do not have ears. They have a membrane on the exoskeleton on each side of the head equivalent to an eardrum.