When did Leeuwenhoek discovered Animalcules?

Then, who discovered Animalcules?

Van Leeuwenhoek's

Additionally, when and where was Anton van Leeuwenhoek born? October 24, 1632

Also asked, how did Leeuwenhoek discovered Animalcules?

In 1668 he visited London and probably saw Robert Hooke's 1665 copy of Micrographia with microscopic pictures of textiles. In 1674 he looked at the water from a lake near Delft and was surprised to see tiny microscopic unicellular pond-water organisms which he called animalcules (1676).

What did Leeuwenhoek look at?

Leeuwenhoek looked at animal and plant tissues, at mineral crystals and at fossils. He was the first to see microscopic foraminifera, which he described as "little cockles. . . no bigger than a coarse sand-grain." He discovered blood cells, and was the first to see living sperm cells of animals.