Mine knows that the crickets bin is right next to her viv, so when she's hungry, she looks intensely in that direction, or even scratch the glass that's on the crickets' side. And when I bring out the bag to powder the crickets, she follows every move I make until I drop the crickets.
At other times, she goes into her veggies bowl and swallows (I would not call that eating) everything in half a minute and stays there looking at us...I assume she means "I want more"!