Imagine 2 boxes. One has an armed mouse trap inside and one has a chocolate bar. There are signs on the box explaining what is inside. You and an infant must each put your hand inside one of the boxes and retrieve its contents . In your understanding of "equal", both you and the infant are considered equal in this scenario when you, an adult capable of reading and reasoning, have a clear advantage on determining the outcome of the box test.
The thought that humans and non humans are equal too broad of a statement. We of course have advantages over non humans. What should be said instead is: humans and non humans have an equal right to live.
There's nothing special about us in the grand scheme of things that puts our lives above the life of anything else. Of course humans consider human life as the most important just as an ant would consider ant life the most important, but there's no universal accountant keeping a list here.
But, as far as we know we're the only creatures with morals, ethics and empathy. We understand that pain is felt by any creature with a nervous system. We understand emotions can be felt by many creatures with brains. We can't truly call ourselves equals but we must be obliged to reduce the amount of pain we inflict on others because we're the only beings who can.
We've reached a point in our understanding of the environment and dietary needs where we can sustain ourselves without needing to enslave other species. The fleeting joy one experiences from eating a Big Mac is not worth the torture of the cow the meat came from.
Honestly it's just a meme. We have deadly snakes and spiders but the death count each year is like single digits. They also just keep to themselves and will only attack if you're a dickhead. Crocodile and shark attacks too are rare. Kangaroos will only fight you if you walk up to one swinging.
Most fear of Australian animals comes from residents of NA but I'd rather my Aussie creatures than the NA bears, wild cats, wolves, moose (meese?) Etc.