In NCERT it is written that all birds and mammals are regulators but they used humming bird to explain why - Biology - Organisms and Populations

Question

In NCERT it is written that all birds and mammals are regulators
but they used humming bird to explain why regulation is
energetically expensive compared to conformation Hence is humming
bird a reguator,conformer or partial regulator? Further does a
humming bird undergo hibernation at night?

Asandra Andrews · Answer

A humming bird is a regulator itself
The sentence just means to say that the process of
thermoregulation is energetically expensive for the humming bird
but does not say that due to that expense it does not
thermoregulate
It does not hibernate but in cool weather it undergoes an
overnight metabolic change called 'Torpor'​​

Hope this helps :)

In NCERT it is written that all birds and mammals are regulators but they used humming bird to explain why regulation is energetically expensive compared to conformation.Hence is humming bird a reguator,conformer or partial regulator? Further does a humming bird undergo hibernation at night?