Animacules, but I don't know why.
He discovered that all animals are made of living cells and he built the microscope.
Bacteria
Antonie van Leeuwenhoek was born in the Netherlands (Nederland)
Antonie's hobby was making magnifying lenses. He made the "microscope". He studied substances including red blood cells, pond water (etc.) He is well known because he was the first person to observe...