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Tree sap is not usually dangerous to humans or pets. But some trees do produce dangerous sap. Notably, ash, birch, cedar and similar saps can irritate the skin but aren’t dangerous. Sap from trees like the Brazilwood, Mahogany, Milky Mangrove or well-named Poison Walnut can be corrosive, cause nausea, or trigger those with asthma. But for most backyard trees, protective equipment like a sturdy pair of gloves should be fine.

Spider egg sacs are meant to last, so you can't crush them. One of the best ways to deal with them is to vacuum them up and then quickly dispose of your debris in the trash so the egg sacs leave your property permanently. Egg sacs surrounded by little spiderlings means that it has already hatched, but you may be able to catch many of these with a vacuum cleaner, too.

Flea eggs can’t take heat, so use that information to your advantage. Take any affected clothes and linens and wash them on a hot setting (140℉ or higher) to kill them off. You can also rid carpets and furniture using heat. After vacuuming all surfaces thoroughly, use a steam mop or cleaner to get rid of the remaining flea eggs and residue. 

Flea eggs also can’t handle extreme cold. You could seal affected linens and store them in a freezer. 

Both spikes and loose nets can be installed over nest sites to prevent the bird from returning, but nets are not a humane option since birds and other wildlife can get tangled in them. 

Spikes are a humane alternative that deter nesting without harming the birds. In small areas, like vents, a very fine mesh net can be installed to prevent the bird from returning. These nets don't generally pose a risk to the birds.