Epona
Sonic: 1 Nov 2006 - 8 Jan 2022
They’re not mimicking squirrels, it’s just the noise the make when they see prey, esp when they can’t access it
Aye it is their excited hunting noise
(If they are indoors and the prey is outdoors, it is sometimes followed by the cat bonking its head against the window, because they aren't quite as bright as we'd like to think)