Similar to tinsel, these long strips of shiny foil are used to decorate a christmas tree. what are they called?

They are called "Icicles".

Sparkly bits of festive decoration, tinsel is a standout among the best time and energetic occasion home embellishments. You can enhance the tree with the glossy strands, yet you can likewise make a great deal of others things and spots shimmer with a touch of Christmas cheer. Along these lines, let us demonstrate to you how! With all it's dynamic metallic shades, impersonating icicles everything being equal and sizes, tinsel is an incredible wellspring of occasion enrichment and DIYing for around the house.

ethologists

Explanation: Ethologists study the character or fundamental values of a person, people, culture, or movement—human and animal behaviours. According to them, a critical period critical period is a phase in the life span of an organism during which there is heightened sensitivity to external stimuli that are compulsory for the development of a particular skill. This is due to the fact that an individual's behavioral characteristics can be more strongly influenced by some stimulus at one stage of development than at other stages. As such for some reason, if the individual does not receive the appropriate stimulus during this time to learn a given skill or trait, it may be difficult, less successful, or most times even impossible, to develop certain associated functions later in life—functions that are indispensable to its survival.