Often used affectionately for small animals or insects.
El bichino que encontré en mi jardín era pequeño y tenía colores brillantes que llamaron mi atención.
The little bug I found in my garden was small and had bright colors that caught my attention.
El bichino que encontré en mi habitación era tan pequeño que casi no lo vi.
The little bug I found in my room was so small that I almost didn't see it.