![Nearly impossible to video track: small shrimp gammarus](https://www.noldus.com/static/images/core-blog/gammarus-1617899293.jpg)
Nearly impossible to video track: small shrimp
Gammarus shrimps are exceptionally difficult to track, but Noldus solved the puzzle, resulting in interesting insights into its ecology.
![Anxiety is ancient – how crayfish resemble vertebrates anxiety-ancient-crayfish](https://www.noldus.com/static/images/core-blog/anxiety-ancient-crayfish.jpg)
Anxiety is ancient – how crayfish resemble vertebrates
Fear is something we all know. It changes our behavior: we freeze, try to escape, or respond with aggression. Fear can also cause anxiety, which is a more complex phenomenon.