This is the 3573rd most frequent Spanish word.
inusual
Uncommon or unusual.
Here, 'inusuales' describes the distinctive, uncommon colors of the bird used as an adjective.
Esta mañana vi un pájaro con colores inusuales.
This morning, I saw a bird with unusual colors.
In this sentence, 'inusual' is used as an adjective to describe an unexpected occurrence, referring to the lack of traffic.
Fue inusual que no hubiera tráfico en el centro de la ciudad a esa hora.
It was unusual that there was no traffic downtown at that time.
Here, 'inusuales' acts as an adjective to qualify the events, emphasizing their rare or extraordinary nature.