Niger (Nyjer) seed is one of the most popular wild bird foods available for garden birds. It is highly nutritious and contains lots of oil. In terms of the actual seed, Niger seed is an ultra fine oil rich seed which is eaten by numerous garden bird species and is especially loved by the beautiful Goldfinches. Because Niger is so fine, it is advised that it is fed in specialist niger or thistle seed feeders - as conventional feeders have ports that are just too large, and the seed would be wasted. .