I probably don't clean our hummingbird feeder as often as I should, but I do keep an eye out for any discoloration or nastiness... And I don't fill it full, so that the food doesn't sit out too long.
thanks for this @ludwigsdiana really important. feeding birds or any wildlife can be really detrimental to them through contamination or providing them with unhealthy nutrition (eg processed foods like bread or chips)
great article!
great article!