Lifting Capacity of Eagles

Bald Eagle Biology

Eagles are predators but they have a very small lifting capacity.  Many times I have described our experiments and field observations on what eagles can lift. 

Generally a male can lift about 1.5 pounds and a female up to 2.5 to 3 pounds -- the latter if there is a good headwind.  However, this is not even lifting this weight for more than a few 100 yards and not necessarily up to a nest.

On the other hand, many a small cat, or parts of a road killed cat, can be lifted.  Eagles have great difficulty handling mink or cats because of 'fighting back' with sharp claws.  So a big 8 -10 pound cat is certainly beyond a bald eagle's capacity but parts of one, particularly cut by vehicle traffic, can and are lifted. 

We have the same frequent problem here but the predator is the coyote -- some live almost exclusively on cats. Raccoons take cats but a big cat can out-climb and out-fight or out-run most coons.

As you probably know cars take most cats.  I and a few close neighbors lose one or two of our barn cats each year. We see them dead on the road or their blood smear left when the coyotes got to them before I could even throw them off the road or bury them.  I recently wrote an item about road kills -- and the good source of food they are for eagles.  However, the other side is that eagles are often killed eating road kills and I spend a lot of time throwing kills off the road for this purpose.

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4 comments

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Authored by: KarlaBabe on Tuesday, May 11 2010 @ 09:39 PM EDT Lifting Capacity of Eagles

on the first day of summer 2009 an eagle flew right over my head with a smaller cat... it was devastating.. at the same moment my young cat was trying to stalk 3-4 young eagles close by on the beach.. i was freaked.. mama cat wasn't too happy either..  i finally herded my cat to where i could grab her and brought her home off the beach..

a few years prior an eagle made a swoop at the cat i had then.. i think she saw the shadow and was able to drop into the rocks out of reach.. the next day an eagle (same one?) went after a 20 lb dog next door but a person saw this and jumped into view sparing the dog any injury..

 

in the past decade i have witnessed 2 eagles demise in the water.. presumably hooked into large fish.. too far away to resue without a ready to go boat, which i don't have..

 

i try hard to remember that nature's way isn't always kind..

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Authored by: diana on Sunday, January 29 2012 @ 03:06 PM EST Lifting Capacity of Eagles
Dear David,
Your past experiments on the lifting capacity of eagles are very interesting. I was wondering about the effect of motion. When we feed our local pair, they almost never stop to pick up the fish but almost always take it 'on the run'. They swoop quite fast so the lift generated by their wings means they can pick up the fish without even flapping. They don't often miss. Once in the air again, they obviously have to flap. They stay low and mostly go no further than about 200 yards to eat in a nearby tree. i used to think this was because they wanted to reduce their danger while on the ground but I suspect the need for a loaded take off may also be a relevant factor. From a standing start, they really have to work hard to get off the ground. Once in the air, aerodynamics give them a hand (particularly into a strong wind) but starting from rest it is all done by muscle. Best wishes,
Mike and Di
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