biology zoology blog benno meyer rochow claws

Locked in, Locked up, Locked on…

Something that’s difficult to open

You can lock arms with someone, you can lock on to something or be locked in or even be locked up or locked out. But this essay is about animals that possess locking mechanisms. In the tropical waters of Ascension Island in the South Atlantic Ocean, for example, I once caught a pair of matchbox-sized trigger fish and observed their behaviour in my aquarium on board of the research vessel “Walter Herwig”. These denizens of the tropical seas as well as their cousins, the file fishes, can wedge themselves into rock cracks and coral crevices in such a way that it is virtually impossible to dislodge them by pulling at their tails. —>—>

biology zoology blog benno meyer rochow with the help of some rolling stones

With the Help of Some Rolling Stones

Rolling Stones in the stomach

Several organs of the body can contain or develop objects normally referred to as “stones”: the gall bladder choleliths, the urinary bladder uroliths, the kidney nephroliths, the testicles testicular microliths and the salivary glands sialoliths. —>—>