Animal and human's brain work differently from each others. Like, if humans don't find enough space to sit properly and comfortably they think it's 'suffocating' or 'too congested' but animals will think its 'perfect'. That's how these little cuties have managed to fit in the most difficult places.
But if you have pets, you must know that these animals look absolutely breathtakingly adorable while trying to fit into these small spaces and probably even falling asleep in there. Check out some pics because they will literally melt your heart.
Or vet's assistant?