Protect them outdoors.

Wasps and lizards. Birds unlikely.

New research suggests that some birds may know who their human friends are, as they're ready to recognize people's faces and differentiate between human voices. having the ability to spot a lover or potential foe might be key to the bird's ability to survive.

We don't have lizards here. How do you protect them outdoors?

------------------------Ways to Conserve Birds-----------------------------

It's easy to get involved in bird conservation, and like anything, some of your most helpful actions begin at home. Environment for the Americas surveyed biologists, educators, conservationists, birdwatchers, and bird enthusiasts to get their best ideas for getting involved in bird conservation.

• Prevent Bird Collisions with our Windows Collisions are one of the most frequent causes of bird deaths. Birds see nature reflected in the window or mistake houseplants inside the building for outdoor plants and fly into the glass. Putting up curtains or window decals helps make the window visible to birds.
• Protect Birds From Pets Unleashed dogs and outdoor cats can harm birds by disturbing, chasing, and even killing them. Keeping your cat indoors and your dog from straying saves millions of birds each year.
• Clean Your Bird Feeders Dirty feeders can spread disease. Disinfect and clean out old seeds from feeders frequently and put fresh water in your birdbath every day.
• Don’t Buy Illegally-Caged Birds Selling wild-caught birds as pets is illegal. Buy only captive-bred birds. Make certain that the breeder or pet store is reputable.
• Use Cloth Grocery Bags and Reusable Bottles Birds that mistakenly eat plastic trash can become ill or even die. Avoiding plastic bags and bottles reduces plastic pollution and conserves resources.
• Recycle Anything you recycle reduces litter and saves resources. Get creative! You can make a bag from used juice containers and bird feeders from old dishes and plastic bottles.
• Restore Natural Habitat in Your Community Birds need a place to live and many bird habitats are disappearing. City parks and open spaces are natural places for birds. Work with your community to recreate the habitat that once existed in your area.
• Keep Your Distance Birds need space for feeding, nesting, and other daily activities. Approaching too closely may cause them to become nervous and deplete much-needed energy reserves. During the nesting season, it may even result in loss of eggs or young to predators.
• Leave Fledglings Where You Find Them Fledglings may spend several days on the ground after they leave the nest before they are able to fly. You can help by keeping people and pets away, so their parents can continue to care for them. If you think a bird is truly an orphan, call a rehabilitator for instructions.
• Slow Down When Driving Cars kill millions of birds each year. Driving slowly gives you more time to respond if there is
  an animal in the road and gives the animal plenty of time to get out of the way.
• Buy Bird Friendly Products You can help preserve bird habitat in Mexico, Central and South America and the Caribbean by buying shade-grown coffee and chocolate. Shade coffee farms, which imitate native forests, have many more bird species than sun coffee farms.
• Plant Native Native plants provide food, nest sites, and cover for birds.
• Teach Others About Birds Talk to your friends about birds and start a club in your community to teach people about the challenges birds face. The more people know, the more they can do to help.
• Get Outdoors and Enjoy Nature You can appreciate the bird habitat near your home. Find a local park and go for a walk or just stroll around your neighborhood.
• Take a Friend Bird Watching Invite a buddy and see if you can spot more birds together.
• Support Conservation. Join a bird club or other conservation organization to learn more and contribute to protecting birds. Volunteer with organizations that preserve habitat and help birds.
• Be a Citizen Scientist Many projects need helpers to gather data on birds and their habitat. Contact your local Nature Center, library or conservation organization to volunteer.
• Reduce Energy Use Riding your bike or walking reduces your carbon footprint and prevents pollution of bird habitats. Switching off the lights in your house not only shrinks your energy bill, but can also help prevent birds from colliding with your windows.
• Avoid Chemicals Birds may accidentally eat pesticide and herbicide pellets or prey that have been poisoned. This can kill a bird or have toxic effects on their own health and that of their growing embryos, including deformation or suppressed immune systems.
• Learn the Hunting Laws Federal and local laws protect sensitive areas and manage the harvest of birds to ensure healthy populations. Purchase a Federal Migratory Bird Hunting and Conservation Stamp. It contributes to habitat which benefits all birds.

My question was how to protect the monarch caterpillars.

I have so many wasps and yellow jackets and am sure they are the culprits. I collect any eggs by cutting the leaf in sections and putting them in a large plastic container with a dampened paper towel to line it with (lid intact, keeps humidiity in). No pic, sorry. Within a few days, they should hatch and feed off the cutting. Check on them daily and add new milkweed when needed. They don't need much when they're tiny. Once they really start chowing down, I move them to individual containers with the inner lid cut off and topped off with a piece of tulle, and feed them larger leaves daily, pic below. I get tulle from the dollar store, normally wedding decoration/craft section, pk of 10 circles). Remove the frass as needed, messy little buggers. Once they get ready to pupate, they generally do it on the tulle, but not always. I then remove the lid, carefully remove the tulle, watching for any webbing that might be on the side. I cut a large section of tulle and put in an outdoor enclosure I built out of pvc and mesh curtains. Inside I have locker shelves that kids use in school, where I secure the chrysalid & tulle, pic below. They generally eclose unscathed. And protected.