very large toad which has a deep booming croak

A very large toad with a deep, booming croak is most likely a cane toad (also called the giant toad, Rhinella marina), especially if you’re in tropical or subtropical regions.

Quick Scoop

• Likely species: Cane toad / giant toad (Rhinella marina).
• Call: Deep, long, rolling or rattling croak that can carry a long distance and sounds low-pitched and “booming.”
• Size: One of the largest toads in the world; adults are heavy-bodied with a broad head and warty skin.
• Where it’s common now: Native to Central and South America but widely introduced in places like northern Australia and various Caribbean and Pacific islands, where it’s often considered an invasive pest.
• Why the deep croak? Larger male toads produce deeper calls, which signal their size and strength to rivals and potential mates.

A bit of natural-history color

On warm, humid nights near ponds, drainage ditches, or garden water features, male cane toads gather in shallow water and start calling. Their deep, droning croak can sound like a distant engine idling or a low mechanical trill, and because they’re so big, the sound carries impressively far. Females are drawn to these deep calls, which usually indicate a larger, more robust male, while other males “read” the call to size up potential competitors. If you share your location and where you heard it (country/region, garden vs. wild wetland), I can narrow down alternative candidates, but in most modern “very large toad with a deep booming croak” situations, cane toad is the best fit. Information gathered from public forums or data available on the internet and portrayed here.