The county's canals are ideal burrowing ground
Palm Beach County's finger canals and drainage canals are lined with soft, sloped, sunny banks — and that's precisely the ground iguanas prefer to burrow into. Unlike a hardened seawall, an earthen canal bank offers no barrier at all; the animals simply tunnel straight into the face.
Each burrow is a channel that lets water get behind the bank face. Rain, tidal movement, and the wake from passing boats then flush the loosened soil out through those openings, and the bank slumps, undercuts, and recedes toward the yard.
Why it compounds
Canal-bank erosion from iguanas is a feedback loop, not a one-time loss. The more burrows there are, the faster soil washes out; and the more the bank erodes, the more soft, exposed face there is for new burrows. A bank that held its line for years can start losing turf, dropping its edging, and creeping inland once a population establishes.
Because the canals interconnect, the animals also travel freely, so a bank cleared in isolation gets recolonized from up or down the waterway.
What it looks like
Distinguishing iguana erosion from ordinary bank wear comes down to the burrow signature.
- Round burrow openings clustered along the bank face and waterline
- Fanned spoil dirt below the entrances
- Undercut, overhanging turf edges where the soil beneath washed out
- Slumped, receding sections rather than broad, even loss
Filling burrows alone won't hold
Filling burrows helps in the moment but is temporary if the iguanas remain — they re-dig the fresh fill, often in the same spots. Durable results come from removing the resident animals first, then collapsing and compacting the burrows and re-establishing the bank, so there's nothing reopening the channels for the water to exploit.
Common questions
How do iguana burrows speed up erosion?
The burrows let water penetrate behind the bank face, and rain, tide, and boat wake then wash that loosened soil out through the openings, so the bank erodes far faster than it would from water action alone.
Can I just fill the burrows and be done?
Filling helps but is temporary if the iguanas remain — they re-dig it, sometimes within weeks. Durable results come from collapsing the burrows after removing the animals so they aren't reopening them.
Will erosion on my bank stop on its own?
Not while an active population is burrowing it. The loop of burrowing and washout is self-reinforcing, so the bank keeps receding until the animals are managed and the face is rebuilt and compacted.
