The female and male cardinals. The male and female can be distinguished from the color of their feathers -- the males look gorgeous with beautiful orangish red feathers. The females do not have that color but grayish yellow with some reddish streak. The song of the male bird, at least to my ears, is absolutely beautiful. They sit perched on tree tops and sing, signalling the coming of spring.
Some kind of finch or sparrow in the first picture. Sparrows in the second and third picture. It seems that there are lots of different kinds of sparrows in the US. I do not know which kind these are.
The above three pictures are not taken with the telephoto lens. Thus, they are not that clear. All the various kinds of birds -- juncos, chickadees, sparrows, finch, titmouse, nuthatch, bluejays, cardinals, sterling and woodpeckers -- that come to our feeder throughout the day. In the second and third picture, one sees the Red-Bellied Woodpecker.
Nuthatch in the first and second picture. I think these birds spend upside-down throughout their lives. Whenever I have observed them in nature, they are always upside down. Tufted titmouse in the third picture in the first row. Chickadees in the first and second picture in the second row. Junco in the the last picture -- these are migratory birds. They are seen in NJ only during winter. They will go away with the coming of spring. Apparently they come from farther north in the US and Canada.