The swallow chooses a mate for life, it will only nest with that bird and no other. A swallow tattoo is also a symbol for everlasting love and loyalty to the family. Swallows travel long distances, only to find their way back to each other at home.
I love the strong lines, angles and symbol of freedom. If I use a bird image I identify with sparrows and robins, or geese, NOT swallows. I feel like the swallow image is a bit too popular for me to like it on me. But I have to say I can see the appeal of