Most birds have hollow bones with internal struts that make them very strong. (Exceptions include swimming birds, like loons, which have solid bones to help them dive up to 150’ for food.)
Birds also have a smaller total number of bones than mammals. This is because many of their bones have fused together, making the skeleton more rigid. Birds do have more neck vertebrae than many other animals to help them groom their feathers. But overall it takes over 65 chubby chickadees to equal the weight of one medium squirrel.
Weight activated squirrel proof feeders close off the feeding ports when a squirrel tries to get at the food.
To see a video of our most popular model - click here
This particular feeder is factory set to close at 4 oz but it is fully adjustable. Here are the weights of some of our feathered friends.
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