| Answer | Crossword Clue |
|---|---|
| microfilters | MICROFILTER, a very small filter |
| microfilter | a very small filter |
| ultravirus | a virus small enough to pass through the finest filter |
| ultraviruses | ULTRAVIRUS, a virus small enough to pass through the finest filter |
| flamingos | A tall wading bird with mainly pink or scarlet plumage and long legs and neck. It has a heavy bent bill that is held upside down in the water in order to filter-feed on small organisms |
| flamingoes | A tall wading bird with mainly pink or scarlet plumage and long legs and neck. It has a heavy bent bill that is held upside down in the water in order to filter-feed on small organisms |
