Leopard gecko substrate?

I just put exo terra brand dry forest bark for the substrate in my leopard geckos terrarium(same as the pet store used for them where I got him) with the plantation soil in his two hides for dampness. I dont feed him in the terrarium incase he chokes on the bark while getting the crickets. I dont ever see him... show more I just put exo terra brand dry forest bark for the substrate in my leopard geckos terrarium(same as the pet store used for them where I got him) with the plantation soil in his two hides for dampness. I dont feed him in the terrarium incase he chokes on the bark while getting the crickets. I dont ever see him licking and picking them up the bark pieces in his mouth when he's just exploring his terrarium. The question is do they have the character to just put random non moving things in their mouths ?
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