What are the "ear of the heart" and the "gland," and is it forbidden to eat them, and are they found in birds?

The heart's auricle is the part where blood collects, and a gland is a solid, almond-shaped piece found in the flesh. Some scholars disliked eating them due to a natural aversion, not because it is haram (forbidden). The correct view is that all parts of permissible animals after proper slaughter are subject to the same ruling as their meat, making all parts permissible to eat except for flowing blood.