Half reptile, half bird, the archaeopteryx stands for a creature caught between two forms. In a dream it is read as being in the middle of a great change, not yet one thing or the other.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.