Bar Flies original pen and ink and watercolour illustration by Rosie Brooks

A "bar fly" is a colloquial term used to describe a person who frequents bars or pubs, often spending a significant amount of time and money there.

The term can also be used in a more lighthearted or affectionate way to describe someone who enjoys the atmosphere and socialising that takes place in bars, but please drink responsibly. 

A fly is a type of insect that is known for its ability to fly and its distinctive wing structure. Flies belong to the order Diptera, which means "two wings," as they have only one pair of wings, whereas most other flying insects have two pairs.

Flies come in many different species and can be found all over the world, including in both urban and rural environments. They are known for their ability to transmit disease and can be a nuisance to humans and animals alike.

Flies have a distinctive anatomy that includes large compound eyes, which give them excellent vision and the ability to detect movement quickly. They also have a pair of antennae that they use for sensory perception, and a proboscis, which is a long, tube-like mouthpart that they use for feeding on liquids.

Flies can feed on a variety of substances, including nectar, fruits, and decaying matter. Some species of flies are also predatory and feed on other insects. Flies have a short lifespan, typically only living for a few weeks, but they are highly reproductive and can lay hundreds of eggs during their lifetime.