Here are some ways nature tells us the season is about to change.

No need to solely rely on a calendar because nature also tells us when the seasons are changing. Here are five animal and plant behaviours to keep your eyes on:

Wattles blooming: Thousands of wattles or acacias bloom in parks, gardens and along roadsides. Wattles, also known as Australian Acacias, are the most common flowering plants in Australia. There are some early blooming varieties with flowers that appear since the beginning of August, while others will bloom throughout the spring.

Birds nesting: Nesting behaviours, like carrying sticks and pet fur, make magpies some of the most obvious nesters. Unlike birds that build nests, cockatoos, rosellas and lorikeets parrots raise their young in tree hollows, so you may see some squabbling over prime nesting locations.

Wildflowers blossoming: It's a sign of the times when native orchids are starting to bloom in national parks. These include poached egg daisies in the arid north and desert peas in the Adelaide Hills.

Bats coming out: As the weather warms up, microbats wake up from a deep sleep known as torpor. If you go camping or you have bats in your backyard or neighbourhood park, listen for their chirping sound.

Reptiles turning up: Our parks and gardens are beginning to come alive as sleepy lizards, skinks, geckos and dragons emerge to bask in the sun. They will lay on flat rocks, concrete and sand as we transition to a warmer season.

We'd like to hear about your signs of spring in the comments section below.