What small animals think it's hot in summer?

Many, many, such as frogs, geckos, ants and so on.

They don't come out in winter because they know it's cold.

Going out to make a living in summer shows that they know it's hot.

If it's too hot, they can't stand it.

Mosquitoes are most afraid of heat in summer.

In hot summer, there are few mosquitoes.

When it rains and cools down for a few days,

Mosquitoes have come out to feed again.