Creature camouflaged in ball turned over, not dead

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Possible Answers:

ECHIDNA.

Last seen on: The Guardian – Cryptic Crossword No 28,576 – Oct 14 2021

Random information on the term “ECHIDNA”:

The neutron detection temperature, also called the neutron energy, indicates a free neutron’s kinetic energy, usually given in electron volts. The term temperature is used, since hot, thermal and cold neutrons are moderated in a medium with a certain temperature. The neutron energy distribution is then adapted to the Maxwellian distribution known for thermal motion. Qualitatively, the higher the temperature, the higher the kinetic energy of the free neutrons. The momentum and wavelength of the neutron are related through the de Broglie relation. The large wavelength of slow neutrons allows for the large cross section.

But different ranges with different names are observed in other sources.

The following is a detailed classification:

A thermal neutron is a free neutron with a kinetic energy of about 0.025 eV (about 4.0×10−21 J or 2.4 MJ/kg, hence a speed of 2.19 km/s), which is the energy corresponding to the most probable speed at a temperature of 290 K (17 °C or 62 °F), the mode of the Maxwell–Boltzmann distribution for this temperature.

ECHIDNA on Wikipedia