An Amazing Rubythroat Journey
By Land or By Sea? Overwintering Ruby-throats begin moving north as early as January, and by the end of February they are at the northern coast of the Yucatan. Some hummers travel by land — skirting around the Gulf of Mexico and following the Texas Coast north. Others migrate over water — 500 miles across the Gulf.
Fueling Up How do hummers fuel up for migration? They gorge on insects and spiders — almost doubling their weight in about a week. Layers of fat build up on the hummingbird's back, belly, and throat. A licensed bander gently blew on this hummer's feathers to see the white band of fat on its belly.
Flight Risks A hummer flaps its wings 75 times per second during flight. It can fly about 25 miles an hour — and even faster with tailwinds. Imagine the risks a tiny bird could encounter on its 500 mile trip across the Gulf of Mexico. What if fat reserves deplete before the tiny hummingbird reaches land 18-22 hours from the start?
Reaching Land After doubling its weight, from about 3.25 grams to over 6 grams, a hummer may weigh only 2.5 grams when it reaches land. Finding abundant food and water sources is essential in the coastal habitats along the Gulf.
Arriving First Hummers reach the coast in late February or early March. Males depart the Yucatan first, followed about 10 days later by the first females. The migration is spread over a three-month period, which prevents a catastrophic weather event from wiping out the population. Are spring habitats ready when the hummers arrive?
When Will Your Hummers Arrive? Look at wind maps to predict which days hummers will cross the Gulf of Mexico, and then watch the Journey North map to see when and where sightings are reported from the Gulf States. Once in North America, migration proceeds at an average rate of about 20 miles per day. Hummingbirds generally follow the earliest blooming of flowers they prefer.
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Where, when, and how do Ruby-throated Hummingbirds migrate in the spring?
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