Tag Archives: migration

Time to Go North

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I was fortunate enough to be in a viewing blind along the Platte River last Friday and Saturday nights, watching sandhill cranes coming in to roost.  Both nights had fantastic weather, beautiful sunsets, and excellent opportunities for our guests to see cranes up close.  However – there was a huge difference between the two nights in terms of the number of cranes that came in to roost.  On Friday night, we could probably see around 30,000 birds from the blind I was in.  On Saturday, the number was probably down around 5,000. 

Sandhill cranes at sunset on Friday night. As the sun went down, the numbers of cranes on the river went up. I'm not an expert at estimating numbers, but I'd guess there were at least 30,000 birds within view of the blind. A big contrast to Saturday night - though Saturday night was nothing to sneeze at, with birds landing close to the blind and a fantastic sunset as well.

It looks like this year’s early arrival of cranes on the Platte is leading to an early exit as well.  Normally, the 24th of March (Saturday’s date) sits right at, or shortly after the peak time to see sandhill cranes on the Platte.  Even if some of the early arrivals have started to head north to breed by the 24th, the numbers are still very high in most years.  This year, it was as if someone opened the gates and let them out Saturday morning, and they all rushed north at the same time.  Don’t get me wrong, there are still enough cranes around that driving the roads during the day and watching them come to the river at night are fantastic experiences.  It’s just different than it was during the 2-3 weeks leading up to last Friday.

It was especially interesting to be in the same viewing blind the night before and the night after the big departure that apparently took place during the day on Saturday.  Saturday was one of those days everyone wishes for on a weekend.  The temperature got up into the low 80’s (normal highs are 55 degrees F this time of year) with sunny skies and light winds.  Before heading to the blind, I spent the day working in the garden and playing baseball with my kids in the backyard.  It’s exactly the kind of day I expect cranes to leave and head north – except that it was a week or two before I would typically expect a mass exodus.

However, Friday’s weather was almost identical to Saturday’s weather, so why did they leave Saturday and not Friday?  On both days, we watched as groups of cranes spiraled up into the sky, riding the warm air currents until they were almost out of site.  On Friday, most of them must have come back down to roost on the river on more time, but on Saturday, they apparently got up high, liked what they saw/felt, set their wings, and glided north.  Maybe the high air currents on Saturday were coming from a different direction (south, presumably) than they were on Friday.  Maybe they used Friday as a practice day and the itch was unbearable two days in a row, so they gave in and headed out.

Going north early can be a risky venture for breeding cranes.  The primary role of the Platte River as a spring staging area is to allow cranes to build fat reserves while feeding on waste corn and invertebrates.  Those reserves are important because once they head north they typically have fewer opportunities to feed as they are busily setting up nesting territories, laying eggs, and caring for their young colts.  Heading north early means they are more likely to find breeding areas that are still frozen and inhospitable.  That can lead to additional stress, less food availability, and a greater chance that things will go badly during the nest season.  Waiting a couple weeks gives them some insurance that conditions will be better in the nesting grounds when they arrive. 

So did the cranes that left on Saturday know something?  Did they leave simply because they’d been on the Platte long enough to fill up with food and energy?  Or are they somehow picking up cues that make them feel good about the weather they’re heading into up north?  I don’t have the answers, but I was glad to be an observer when they made their choice. 

I wish them luck.

Winter Cranes – Part Three

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It sure looks like we’re going to have sandhill cranes around for the entire winter.  In fact, the consensus among biologists is that the number of cranes has actually grown over the last couple of weeks.  There was even a sighting of three whooping cranes this week, a common event in April, but nearly unheard of in January.

If you haven’t been following this story, Nebraska’s Central Platte River is normally the site of a massive staging event of sandhill cranes each spring, when about 600,000 cranes converge on the river.  Those cranes roost overnight in the river and spend their days feeding and building body condition for the rest of their migration and the breeding season.  Typically, cranes begin arriving on the Platte in mid-February and are mostly gone by early April.

In the fall, cranes pass through the Platte Valley again on their way south, but they don’t usually appear in large numbers or stay very long.  This past fall, however, we kept seeing groups of cranes hanging around, and they never seemed to leave.  By December, it was clear that something unusual was happening.  I speculated in an earlier post about what might be going on, but no one really knows for sure.

This morning, on my drive out to the Platte River prairies, I stopped for a few minutes to look around one of our riverfront prairies just because I hadn’t been there for a while .  As I drove into the property, I got to watch three immature bald eagles chasing each other – apparently playing follow the leader – flying less than a foot apart from each other.  That was pretty impressive, but when the eagles got close to the river, they flushed several hundred cranes into the air.

The cranes circled a few times and returned to the river.  Grabbing my camera, I belly crawled through the tallgrass and shrubs along the river’s edge until I got into a position where I was well hidden but could see and photograph the cranes.  I spent the next 15 minutes or so watching them dance around and listening to calls I normally don’t get to hear in January.  There were only about 500 birds in front of me – a far cry from the tens of thousands that will be here in about a month – but that didn’t really diminish the experience.

Sandhill cranes on the Platte River in January.

I couldn’t stay long because I was supposed to meet some other people, so after I’d delayed as long as I could, I belly crawled back away from the bank and made my way back to my vehicle.  On the remaining 6 miles of my drive, I saw another couple thousand cranes feeding in the fields and meadows.

All in all, it was a pretty good start to the day.

The cranes seemed to be dancing and posturing just as they typically do later in the spring.