i know my BP's are very smart. when i walk into mu room with a paper bag(what i carry the rodents in) it doesnt matter who is being fed, as soon as they see the bag they come out in striking position. and my male zulu who is in the cage with the sliding glass front always, always, always pushes up against the glass and pushes it to where it would open. luckily it doesnt because he cant get any traction on the glass.