Just my two cents. I put my frozen rat pups in a cup run hot tap water through about a min, fill to the the top and let sit about 30 min. I then drain water and run the hot tap water again for about a min or longer. I then stop the hot water at the rim of the cup go over to the tubs, pick up the rat pups with tongs and jiggle them in front of my Bp's nose. At times it shys away but I continue to jiggle the pup water dripping and all. My Bp will smell it and strike. Other times I just put it in fromt of his nose and it strikes instantly. I always shake the rat with the thongs once its coiled aswell to make sure it holds on to it. Lastly I feed in the evening or night. Hope it helps.