Intrigued,Dinets makes two discoveries,"The crocodiles tend to carry sticks near egret colonies, mostly at nest-building time,"he says.Why? The crafty crocs are using sticks as bait to lure the unsuspecting birds closer. Then when an egret reaches for a stick to add to its nest, the hungry croc quickly opens its mouth.Snap! It's bye-bye,birdie! Dinets's research proves that reptiles use tools. It also makes crocodiles the only animals scientists know that hunt "in season.