Very little. In the UK, from three or four pounds (say $5). It may become a fairly expensive hobby filling up the feeders as bird seed can cost about £10 for a (large) bag.
Yes, crows are known to eat from bird feeders, as they are opportunistic feeders and will consume a variety of foods, including seeds and nuts found in bird feeders.
One can purchase Droll Yankee bird feeders in a local store. However, it is much easier to find them online on a website such as Amazon, which sells a wide variety of items.
Yes, robins typically do not eat from bird feeders as they prefer to forage for insects and worms on the ground.
not for sale
91000
Bird feeders and bird baths.
You can get different types of bird feeders. I have a wild bird seed feeder and peanut feeders, and they attract the blue tit and finches, but mainly blue tits
Yes there are modified bird feeders for many birds, for example a hummingbird feeder has small holes for their different beaks. There is no bird feeder for all birds.
all birds eat from bird feeders its just getting them there without them being spooked so they will come back
Predators.
Mostly from the ground and Bird feeders
To effectively keep blackbirds away from bird feeders, you can try using feeders with smaller openings, placing feeders in open areas away from trees, using feeders with weight-sensitive perches, and offering food that blackbirds don't prefer, such as nyjer seed or safflower seed.