Bryozoan clumps aren’t an egg or just one animal at all. They form this hard shell as they are hundreds of creatures banded together. The pods, known as zooids, are each a fraction of a millimeter long. They lack any respiratory or circulatory systems, but their central nerve ganglion allows the animal to respond to stimuli.

These pods are hanging from tree roots, and actually help clean the lake

The tiny invertebrates possess both male and female reproductive organs, allowing them to self-clone and spread through clumps of cells on the organism known as statoblasts.

Each statoblast can reproduce asexually. They do this by breaking off from a colony, allowing the animal to reproduce rapidly if the space and the weather are suitable. The animals eat phytoplankton and bacteria lurking in water.

Join the Mirror’s SMS news service to get the biggest breaking stories delivered straight to your phone. Click here to subscribe.

Fossil records suggest they may have evolved from an ancient marine worm. Their grandparents, ancient bryozoans, date back as far as 470 million years. For perspective, dinosaurs came around 245 million years ago.

The Oklahoma Department of Wildlife Conservation (ODWC) shared the photos on social media. “What is that??? If you’re out boating somewhere like McGee Creek Reservoir you may notice these strange jelly-like balls hanging from submerged tree limbs,” begins the post.

“These are Bryozoans, and they’ll likely show up in large numbers this summer. Don’t be alarmed these microorganisms are native and are of no danger to you or wildlife. In fact, they are an indicator of good environmental quality and clear water!”