Mrs Twinkle has a hole in her bucket, but we have a hole in our glacier, which no amount of straw could fill ! I’m not sure how or when it appeared, but I went to check on it today and I think it’s slowly collapsing into itself. You would think that a sink-hole might have appeared underneath, for the ice to fall into. But my theory is that something stopped the central base of the glacier moving forward and this allowed the ice at the edges to curl around in front. The angle of the hole is also pointing forwards, not upwards, so this also seems to suggest that the bottom of the hole has stopped moving while the top keeps going. If you have any other ideas, please let me know.