Consider the weight of a bird collar. We recommend that the collar you choose weighs 25% or less of your birds weight. For instance, if your bird weighs 100 grams, choose a collar that weighs no more than 25 grams. Our designs are weight conscious.Think about it like this… Your bird is already stressed. Its immune system and stamina maybe weakened. Your bird will need to build up strength to carry the weight of a collar. It will also need to develop emotional stamina to tolerate the collar.