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In England, at a time when milk was still delivered to doorsteps each morning in foil-capped glass bottles, a songbird called the great tit started pecking through the caps and drinking the cream in the necks of the bottles. This behavior spread through the great tit population in a matter of years. The emergence and spread of this behavior probably depended on
Spleen
An organ adjacent to the stomach that filters blood, disposes of worn-out red blood cells, and helps fight infection.
Lymph Node
Encapsulated mass of lymph tissue found among lymph vessels.
Thymus Gland
An immune system gland located behind the sternum that produces T-cells for the adaptive immune response.
Lymphatic Nodule
Small accumulation of lymph tissue lacking a distinct boundary.
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