Never, they need twice their body weight in nectar to survive. If not, they will die.
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If you live in an area where hummingbirds migrate south for the winter you should keep the feeders out until nectar is no longer being taken and make sure that the feeders are out early in the spring to catch the first arrivals for the next summer.... basically the first answer is correct if you live in a country where humming birds are present all year.
Don't stop! They know when to carry on about migrating. Stop when you have no birds.
When you feel like it!
Yes, hummingbirds are generally not afraid of bees when feeding on nectar because they are able to outmaneuver them with their agility and speed.
Whenever there are no more hummingbirds to feed. Hummingbirds migrate by internal calendars based on day length, no food availability, so leaving your feeder out will not stop them from migrating, A good rule of thumb is to leave your feeder up until two weeks after the first hard frost to provide extra energy for late-migrating hummingbirds.
Using a hummingbird feeder with a perch can attract and feed hummingbirds more effectively. The perch allows hummingbirds to rest while feeding, reducing their energy expenditure. This can attract more hummingbirds to the feeder and provide them with a convenient and comfortable feeding spot. Additionally, the perch can make it easier for you to observe and enjoy watching the hummingbirds up close.
It is unlikely that hummingbirds would harm eagles, as they are much smaller and have different feeding habits. Eagles are apex predators and generally not threatened by smaller birds like hummingbirds.
you don't have to stop hand feeding your lorikeet if you do though it just might make the lorikeet trust you more.
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No hummingbirds do not go in groups because they have to go on their own so they can learn things that hummingbirds ususally do and live up until 3,4, or 5 years it depends on the type of hummingbird.
Hummingbirds can perch on branches to rest or feed, but they are also known for their ability to hover in the air while feeding on nectar from flowers.
You stop feeding them when they die.
Most birds do not. However, hummingbirds may spread pollen when feeding on nectar from flowers.