Bird Glossary - Smell
Seed birds like chickadees and titmice don´t have strong senses of smell or taste. They have superb eyesight though, and they can see the fruits or seeds in the suet. Their olfactory lobe in their brain is much smaller, proportionally, than in other animals.
Why is this? Well, the things birds eat normally aren´t very odorous. With all of the other things birds have to do very well, and with their brain needing to fit neatly into their aerodynamic head, the smell and taste probably got left by the wayside long ago.
This works well for anti-sqirrel birders, though. Squirrels definitely have a good sense of smell and taste. Sprinkle some hot pepper into the seed and the squirrel will hate it, but the birds won´t even notice.
Not all birds have this deficiency. Carrion birds are different, being able to smell out their prey from many miles away. For your average nuthatch or downy, though, a stuffed-up nose is just fine.
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