Ask Mr. Smarty Plants

I could find two vines that are called "hummingbird vine"—one native vine, Campsis radicans (Trumpet creeper) and the non-native, Ipomoea quamoclit (cypress vine).  I found several lists for birds for toxic and non-toxic plants from:

• Planned Parrothood
• Cockatiel Cottage has Trumpet Vines listed under "Toxic Plants".
• Avian Web
• Hot Spot for Birds has a list of plants that are safe for birds.
• BirdsnWays lists toxic, unsafe plants
• Bird Channel
• Animal and Pet Adventures

Unfortunately, only the last two lists have scientific names for the plants, the most reliable name by which to identify them.  I also checked several other toxic plant databases that are not specific to birds:

• Cornell University's Plants Poisonous to Livestock
• Canadian Poisonous Plants Information System
• University of Pennsylvania Poisonous Plants
• Toxic Plants of Texas
• Poisonous Plants of North Carolina lists Campsis radicans (trumpet creeper) as mildly toxic if eaten.

Since trumpet vine appears on two different lists, it would be my advice not to use it.  Although cypress vine does not appear on any of the lists, I would advice you not to use it either.   Just because a plant isn't on the list, it doesn't automatically mean it isn't toxic.  I think I would pick something from the lists of "safe" plants to put in the aviary.  The Bird Channel lists honeysuckle as safe.   Lonicera sempervirens (Coral honeysuckle) is a Central Texas evergreen native that has beautiful red flowers.  Cockatiel Cottage, Hot Spot for Birds and Animal and Pet Adventures list passion flower vines as safe.  Passiflora incarnata (Purple passionflower), Passiflora affinis (Bracted passionflower) and Passiflora lutea (Yellow passion vine) are native to Central Texas.