Hello everybody, I've had a few years of landscaping and its my hobby now, but I haven't got alot of experience with ponds. I put a preformed one in my yard last year (200gl). Unfortunately I don't have enough $ right now to get a pond liner. Anyway, I just broke through the ice to see if my fish were still alive and found that were all dead. I found the reason for their death, there were 12 dead frogs in my pond. They came last year and i guess they didn't want to leave. Where do the frogs go in the winter? Are they supposed to burrow in the bottom of ponds and hibernate? With my pond they can't because i didn't put any mud or dirt for the bottom. I noticed the frogs had a difficult time trying to get out of my pond last year because the side of the pond was a drop, kind of like a pool, instead of a gradual slide down like normal ponds. I had a couple of dead birds that drown in my pond also. If anybody has any info please let me know it would be greatly appreciated. If there is a good web site for building ponds for beginners could someone give it to me. Thanks for your time.