Bird runny droppings: when to worry

A bird's droppings are one of the most reliable health indicators available to owners. Because birds metabolise food rapidly and their droppings are easy to observe, changes in droppings often appear before any other sign of illness.

Understanding normal bird droppings

A normal dropping has three components:
- Faecal portion (solid): green to dark green in most parrots, brown in finches and canaries; formed and tubular
- Urates (white or off-white): solid, chalky material; the bird's equivalent of urine concentration
- Liquid urine: a small clear liquid portion around the solid material

What "runny" actually means

True diarrhoea in birds means the faecal portion is liquid or unformed. This is different from polyuria (excess liquid urine surrounding normal solid faeces) — an important distinction because they suggest different problems.

Causes of loose faecal droppings

- Dietary change — a sudden introduction of fruit, vegetables, or a new food causes temporary loose droppings in most birds. Usually resolves in 24–48 hours.
- Stress — excitement, new environments, or handling. Loose, green droppings are a classic stress response.
- Bacterial infection (Salmonella, E. coli, Campylobacter) — typically accompanied by lethargy, fluffed feathers, reduced appetite. Requires antibiotic treatment.
- Parasites (Giardia, Trichomonas, worms) — Giardia in particular causes chronic intermittent loose droppings; common in cockatiels, budgies, and lovebirds.
- Viral illness (Circovirus/PBFD, Polyomavirus, Bornavirus) — serious systemic diseases; droppings change is often accompanied by weight loss and feather changes.
- Proventricular dilatation disease (PDD/Avian Bornavirus) — undigested seeds or whole food visible in droppings alongside weight loss
- Liver disease — bright yellow/green or lime-coloured urates alongside loose droppings; significant finding

Causes of increased liquid (polyuria — more urine, not diarrhoea)

- Fruit-heavy diet (normal)
- Kidney disease
- Diabetes (uncommon but occurs)
- Heavy metal poisoning (lead, zinc)
- Stress

When to act immediately

- Droppings are completely liquid with no solid component
- Blood visible in droppings
- Black, tarry droppings (digested blood)
- Lime-green or yellow urates
- Accompanied by lethargy, fluffed feathers, or reduced appetite